SHMARQL

Edward Mills Purcell

<http://www.wikidata.org/entity/Q183270>

American physicist (1912-1997)
Edward Mills Purcell
rdfs:label
"Edward Mills Purcell"@en
skos:altLabel
"Ed Purcell"@en
"Edward Purcell"@en
schema:description
"American physicist (1912-1997)"@en
schema:dateModified "2026-10-31T23:57:42+00:00"^^xsd:dateTime
schema:version 2563200850
wikibase:identifiers 96
wikibase:sitelinks 76
wikibase:statements 157
p:P1006 wd:statement/Q183270-4add5be9-4311-3ae9-12dc-39cfcd33bfaa
wd:statement/Q183270-92179B79-7F0E-41B0-8576-BE80A75ADF9F
p:P101 wd:statement/Q183270-29B7D305-CD27-4CB7-833B-1194D3FE86B8
p:P1015 wd:statement/Q183270-401C7176-AA96-4CF4-966E-7148D9FD5B09
p:P10227 wd:statement/q183270-5a68ecbe-40fb-c469-3a66-b9984afdde0c
p:P10242 wd:statement/Q183270-D6E45E9A-E3E8-45BC-9EF3-AEE423BCC10D
p:P10565 wd:statement/Q183270-F252A9FB-219B-4B5D-A7A8-835849C5231E
p:P106 wd:statement/Q183270-4F1C2974-C473-4FAC-9407-409269F03C4D
wd:statement/Q183270-C5A728B8-1E9C-4349-B2A7-1C0B3DDA8D00
wd:statement/q183270-DA797954-553E-476F-886C-E29268580BE1
p:P10704 wd:statement/Q183270-F977F939-C539-4525-9596-605EF3D55B6D
p:P108 wd:statement/Q183270-2262CEF7-F0F5-4D64-837F-7DADB90AB834
wd:statement/Q183270-E2BC49A6-5E78-4360-9519-4F50BCB2247A
p:P10832 wd:statement/Q183270-E2ECBA8D-4C97-4893-8E7C-44690517E15F
p:P11496 wd:statement/Q183270-AAEE6AC7-6D6A-4CF7-95BF-CABC85CA881C
p:P11514 wd:statement/Q183270-478C7C1B-8853-41BE-9A54-C20FF22EA75D
p:P1153 wd:statement/Q183270-acb0ce01-4a61-8a5f-e0c9-318a0d97164e
p:P11686 wd:statement/Q183270-B92C411D-E7BE-4077-B4DF-8C3A7EEBFB01
p:P1207 wd:statement/Q183270-E7767325-1385-4F9B-88F0-850BDA5982CF
p:P1225 wd:statement/Q183270-76898CF6-920C-4CA9-93D5-85C9C99D620C
p:P12385 wd:statement/Q183270-e9bbaa9d-08a4-4da2-9b5f-f03f06b0629f
p:P1263 wd:statement/Q183270-C40548A7-D64B-4EAD-962B-4C477FB26919
p:P1280 wd:statement/Q183270-75db2d35-4404-0719-7c21-06e3c6e61b37
p:P1284 wd:statement/Q183270-85AB4043-FF85-4D8F-94CD-F8B1289F0F88
p:P1296 wd:statement/Q183270-E2ECCC37-352D-4BD8-A020-BDD4529BB54B
p:P12984 wd:statement/Q183270-EB6D6E1E-BD06-4214-9B3C-EA5773B49628
p:P13049 wd:statement/Q183270-A84EE74F-3C5A-4CE6-8070-083B473C36A5
p:P1315 wd:statement/Q183270-C3BB46FE-5ED3-4CDF-AFE7-89AA4C355542
p:P1343 wd:statement/Q183270-1c0d2b9d-3f5a-4937-9f24-936cce433667
wd:statement/Q183270-42B50AB3-ED8E-4D6A-8CAE-AB4412460104
wd:statement/Q183270-a0e3965a-4a7a-5cd2-edc3-2e33508c2b9b
p:P13591 wd:statement/Q183270-7B7E40A9-38B4-4A78-B7CF-B1E166A91996
p:P13613 wd:statement/Q183270-98AACA92-C695-4610-A011-0DE8EB06604B
p:P1368 wd:statement/Q183270-A91548BE-55B8-4096-8DCE-506DC54C069E
p:P1411 wd:statement/Q183270-888CA68F-59C3-4C4D-9D34-8E5F8E829759
wd:statement/Q183270-8C358214-CEC7-4709-8350-F7F19EC3D166
wd:statement/Q183270-B46A2AB2-D5D2-48F6-ADA1-85A4369C7B7C
wd:statement/Q183270-EE5F4B49-DB58-4391-83CE-991CCAF4D606
p:P1412 wd:statement/Q183270-9EB1330E-C8E0-455A-B37E-6AF50159D326
p:P1417 wd:statement/Q183270-92FC8AB9-B079-44B7-9428-E5B7DECEB3F2
p:P14178 wd:statement/Q183270-7B1390C5-63C0-41B6-A3E7-02E0897A6F4F
p:P14541 wd:statement/Q183270-23189E9B-0BE2-4161-916D-E379E1517B31
p:P1556 wd:statement/Q183270-9B292FA6-BEC9-443B-A99D-93986C2CA5F0
p:P1559 wd:statement/Q183270-86c1e605-4a35-34d1-b34e-a71abcafff8b
p:P1580 wd:statement/Q183270-3A0A41E0-85F4-48DF-B9D5-FEF1AE3A54D4
p:P166 wd:statement/Q183270-02112AA5-1D2F-4221-9122-C27C996CF419
wd:statement/Q183270-23e3a283-4f2a-9973-4d3a-83c3176bb148
wd:statement/Q183270-26DCD738-67D9-4723-8167-1223976126AD
wd:statement/Q183270-45EEC54C-5043-4566-85A4-1BA9F2A06B4B
wd:statement/Q183270-5149228E-8578-4BD7-A450-16D47321F1A4
wd:statement/Q183270-5188d150-410f-531a-d40a-42b0a93b8e58
wd:statement/Q183270-902D8ECC-CE69-44D4-9199-4C4DA0FEAAAA
wd:statement/Q183270-CE2749B8-F1FF-4388-893F-E73EB565A9AE
wd:statement/Q183270-F3835B3D-4358-4661-B789-638AA3FA4E23
p:P1695 wd:statement/Q183270-7ca06180-42d8-4125-99ff-906d0d48d24d
p:P18 wd:statement/Q183270-FB386662-E0AA-4D5B-8C16-8359DAB92760
p:P1801 wd:statement/Q183270-b6e98251-48f4-e13c-8e59-1e3df788a5e9
wd:statement/Q183270-c0979a9c-4e8c-5f4e-733b-d72324b2a9ad
p:P184 wd:statement/Q183270-861C870A-C7E0-4751-BBFF-1312435C5698
wd:statement/Q183270-f6a92fc8-5cc2-4c72-9e4b-1fccc734b956
p:P185 wd:statement/Q183270-539fbb72-4b95-40cf-1d78-f5c0416a9a61
wd:statement/Q183270-61f61f5c-7f4c-4ff1-a101-d7535795ef19
wd:statement/Q183270-855830a9-efc0-4dc9-bfdc-735d284fdb17
wd:statement/Q183270-BA237DBD-8485-4964-8EA2-F302F62F73AD
wd:statement/Q183270-D2051F94-0F78-4217-812A-0AA12571464C
wd:statement/Q183270-FF36197C-3906-405C-B060-DF267F4885FA
p:P19 wd:statement/q183270-01FFC6C7-685C-43CD-BAC9-70DD69874434
p:P20 wd:statement/q183270-758E66C9-5697-43E4-9FE8-5A23E9CBE9BB
p:P2021 wd:statement/Q183270-E4914D49-36AA-469F-B831-576C9BD4ADB1
p:P21 wd:statement/q183270-8841AF59-3F00-4DF1-917B-1F0B5B31E074
p:P213 wd:statement/q183270-B56A82FB-B8FE-4402-8D09-661E969D6D35
p:P214 wd:statement/q183270-BB484722-D3A9-4066-93D4-E305F1D3003E
p:P2163 wd:statement/Q183270-1DD74C7C-2C78-496C-BA73-C3DA2D9AF29C
p:P227 wd:statement/q183270-B6375103-7EA2-41EC-9F17-19F61AE54CCF
p:P2381 wd:statement/Q183270-f36c809c-42ea-1362-7b89-13a0d436da14
p:P244 wd:statement/q183270-7E5E41EB-F032-4D55-A24A-B9AA2BBC5A93
p:P2650 wd:statement/Q183270-6898AE27-A4AF-42C5-946D-AAE501500CA8
p:P268 wd:statement/q183270-F2AC0F99-E117-4663-9E03-248734770868
p:P269 wd:statement/q183270-850FC94C-2F5D-4DC3-A55C-BF31D9205042
p:P27 wd:statement/q183270-136DF7F4-29F5-4EE6-83EE-2DF638F8BC77
p:P271 wd:statement/Q183270-4d8806cd-4198-1bc9-66e4-0360abcc2e8d
p:P2924 wd:statement/Q183270-1540E20E-13C6-48C6-96A6-8B35A1B26AF2
p:P2949 wd:statement/Q183270-BD39DABD-D8F9-4B66-BA41-45832B8E9374
p:P3065 wd:statement/Q183270-07c6d2d4-48a9-929e-3b7a-d6f803496092
p:P31 wd:statement/Q183270-240F9CF8-61D5-4B35-BEE7-3DFBF7C68F70
p:P3219 wd:statement/Q183270-22191D4F-57A2-4A19-9349-0E25843DA5C3
p:P3222 wd:statement/Q183270-01BEDAD1-1BA6-442C-BD70-EF0AC852D431
p:P3348 wd:statement/Q183270-DD8FAACB-1748-4577-B306-E48BBD6F0D71
p:P3360 wd:statement/Q183270-e585a4fe-4596-5706-e65f-657ceeb1dc9b
p:P3365 wd:statement/Q183270-FB52B0C8-13E0-406F-A47C-08D674E0D9F0
p:P3368 wd:statement/Q183270-72730EF9-0F1C-4BD2-BF2B-41B2E6B5FE57
p:P3388 wd:statement/Q183270-E5958926-C623-45A0-B301-153238AE83C2
p:P3430 wd:statement/Q183270-FF530F68-D3A5-40CD-8AF7-2A60D9377F7F
p:P349 wd:statement/q183270-A8112F2A-3178-4DCE-9340-DA82888E1F4E
p:P3630 wd:statement/Q183270-b8a8dc0c-4957-5060-8282-c1fb5220d6b2
p:P373 wd:statement/q183270-AD8AD1C5-12BA-49F3-BDBE-989D1B30AB75
p:P396 wd:statement/Q183270-E7C5A666-5963-4B52-B27D-1D2F4245A4D9
p:P3987 wd:statement/Q183270-DEDF9D39-FE53-4509-89D4-202062CB5F04
p:P409 wd:statement/q183270-a326e8a3-427c-8c5c-a0a0-b3cc2f78fa16
p:P4293 wd:statement/Q183270-77349BF4-E164-4D8A-AF05-228C42C96D99
p:P4342 wd:statement/Q183270-3381DA10-4890-4745-AB9B-1B194951D1F8
p:P4590 wd:statement/Q183270-0473CB34-C5B0-412A-BB48-38F6B4EC5099
p:P463 wd:statement/Q183270-23361CB6-6EC1-41F5-A1D4-B937A2768C07
wd:statement/Q183270-7B10CA54-CB06-456E-B2B4-18489EBB1F13
wd:statement/Q183270-A2B9B77A-9864-47B3-892E-9C505E3DA403
wd:statement/Q183270-EC1DBDB1-A66F-4244-A75D-67FC41E25B6F
wd:statement/q183270-BECD901D-02C0-48F2-97DE-55284BBB9FF3
p:P4823 wd:statement/Q183270-6C64E627-B435-4278-959C-03ACE398013E
p:P4955 wd:statement/Q183270-b18e1207-42ff-f7aa-e84b-6b6293d2fb67
p:P5019 wd:statement/Q183270-3F1846B6-34D8-4C55-B39B-9661A7F75473
p:P5034 wd:statement/Q183270-7dd6712a-4441-a7f3-38c2-d2c19f5fe41a
p:P535 wd:statement/Q183270-97f6a821-0b55-4918-956b-473153376ac9
p:P5361 wd:statement/Q183270-5954C002-6ED9-4846-8D96-3C420F11ACA9
p:P5375 wd:statement/Q183270-AB2F130A-6E71-4528-B472-D1263A1B3F6C
p:P5380 wd:statement/Q183270-bc6e780c-4cb8-cea2-fff9-6cb974938302
p:P5419 wd:statement/Q183270-BA9DA28D-6B16-47FA-8626-09A992FFB023
p:P549 wd:statement/q183270-8B299D15-D910-4535-B3A6-890B9CCCE56E
p:P569 wd:statement/q183270-1C3051E3-5F15-4FB8-893E-39215F933E38
p:P570 wd:statement/q183270-3EAA23BB-3444-4871-B541-1115EF034A1F
p:P6104 wd:statement/Q183270-442e5026-41f0-2c4b-e8e7-19a43ff0450d
wd:statement/Q183270-90858245-6176-4581-B6ED-AE8A2F3C072A
wd:statement/Q183270-9543401e-4ccf-2dac-37bb-56f9faf0e360
wd:statement/Q183270-abac4efd-4659-8bed-4692-fef481af9499
wd:statement/Q183270-c34c4860-4fd9-f7ba-7fa6-8a51b5555ff7
p:P6385 wd:statement/Q183270-ba9dc5bb-4b30-0b1a-5faf-444ec680334e
p:P6394 wd:statement/Q183270-53befc0c-440f-ab33-42b5-0dc1ecd1f64d
p:P646 wd:statement/Q183270-E8B8B639-C234-46DB-AD63-CD1A701F408B
p:P6551 wd:statement/Q183270-E4AD45FB-8229-4987-B56A-C5A9C4D6571B
p:P6706 wd:statement/Q183270-E5A10624-8487-478A-A8F7-81ABE1EE4C1D
p:P69 wd:statement/Q183270-77EC52B9-C490-4817-A596-93D48CB9A36F
wd:statement/Q183270-F33B65F5-C0CC-48E8-8943-76D3D08B7571
p:P691 wd:statement/Q183270-18741BEA-4EC3-4E7A-94AD-EAE100F9A7AA
p:P7184 wd:statement/Q183270-B1E6F10A-F989-4FE2-9F43-22C3DF24523F
p:P7293 wd:statement/Q183270-c0193bfb-4d7a-1420-1034-82c09c6aac92
p:P7305 wd:statement/Q183270-601A613F-2B9D-4555-9C9F-03E98C5BD535
p:P734 wd:statement/Q183270-7abe034f-4550-004c-7217-99eab13ad56d
p:P735 wd:statement/Q183270-01f9b1c6-41cc-0174-fa32-a05bd809bb32
wd:statement/Q183270-DFA11CF7-37CE-44D5-B579-E1FA6203E448
p:P7666 wd:statement/Q183270-6CEB6507-27D4-4B04-B8AE-E28A8E2FA962
p:P7699 wd:statement/Q183270-5e2ee5ca-4342-717e-c614-f287d4fcba56
p:P7902 wd:statement/Q183270-85A58949-18D3-4749-84F4-70ACE2501B99
p:P7982 wd:statement/Q183270-648011EA-CE04-460D-9CAC-7928CB9EBD53
p:P800 wd:statement/Q183270-94a78964-4358-5aa2-5c5c-ae0fa52a9526
p:P8024 wd:statement/Q183270-512AB0FF-7E6B-420C-BFA2-427212FA1426
p:P8179 wd:statement/q183270-e4ef70a3-4c98-5ba2-4cb3-310aed0e5265
p:P8189 wd:statement/Q183270-b8ad718d-4600-f1e2-7881-38556d9b8318
p:P8313 wd:statement/Q183270-BAACB335-D472-4609-84F8-8084A455EC29
p:P8349 wd:statement/Q183270-DB19796C-14C7-461F-AAA2-20A44A15E6C8
p:P8445 wd:statement/Q183270-3C015069-E991-4516-80C4-3DD6063058D4
p:P8612 wd:statement/Q183270-3fa88216-4f0b-bffd-46e8-05fce5941786
p:P8848 wd:statement/Q183270-A2EF57F6-28FE-4B18-B835-E26CBE1C033E
p:P8880 wd:statement/Q183270-E04F8489-FD33-4904-A6CB-470C78AFCF2A
p:P9371 wd:statement/Q183270-6B246D74-DE41-4DB7-B186-2747EEF2AA54
p:P950 wd:statement/Q183270-5248F993-E86B-4DCA-9C7C-2049EE4A2B30
p:P9626 wd:statement/Q183270-2F9CF149-78D7-4CCA-A2DF-F454588E86B5
p:P9964 wd:statement/Q183270-360B2A8A-52BA-48AD-93E8-479CF4AAA33D
p:P9984 wd:statement/Q183270-CC6D933B-43DE-442B-9D10-3BEF97F9DE12
p:direct-normalized/P1006 <http://data.bibliotheken.nl/id/thes/p069668809>
<http://data.bibliotheken.nl/id/thes/p339000287>
p:direct-normalized/P1015 <https://livedata.bibsys.no/authority/90167147>
p:direct-normalized/P11496 <https://cir.nii.ac.jp/crid/1140282266752481792.rdf>
p:direct-normalized/P214 <http://viaf.org/viaf/79085360>
p:direct-normalized/P2163 <http://id.worldcat.org/fast/116262>
p:direct-normalized/P227 <https://d-nb.info/gnd/140990437>
p:direct-normalized/P244 <http://id.loc.gov/authorities/names/n83151128>
p:direct-normalized/P268 <http://data.bnf.fr/ark:/12148/cb122774706#about>
p:direct-normalized/P269 <http://www.idref.fr/031589669/id>
p:direct-normalized/P271 <https://ci.nii.ac.jp/author/DA00634815#entity>
p:direct-normalized/P3348 <http://data.nlg.gr/resource/authority/A199902>
p:direct-normalized/P349 <http://id.ndl.go.jp/auth/ndlna/00473387>
p:direct-normalized/P4823 <http://dx.doi.org/10.1093/anb/9780198606697.article.1302644>
p:direct-normalized/P5034 <http://lod.nl.go.kr/resource/KAC201908679>
p:direct-normalized/P5361 <https://bl.natbib-lod.org/wd-PurcellEdwardM>
p:direct-normalized/P8024 <http://data.nobelprize.org/resource/laureate/59>
p:direct-normalized/P950 <https://datos.bne.es/resource/XX891273>
p:direct-normalized/P9626 <http://dx.doi.org/10.1007/978-0-387-30400-7_1131>
wdt:P1006 "069668809"
"339000287"
wdt:P101 nuclear physics
wdt:P1015 "90167147"
wdt:P10227 "vtls001278527"
wdt:P10242 "05042/eu_p_3592/p3592"
wdt:P10565 "116813"
wdt:P106 university teacher
nuclear physicist
physicist
wdt:P10704 "1999.0029"
wdt:P108 Harvard University
Massachusetts Institute of Technology
wdt:P10832 "E39PBJpjcQK6y3r4rygR3Jyrv3"
wdt:P11496 "1140282266752481792"
wdt:P11514 "piorsell-eduard-mills-a89f7a"
wdt:P1153 "22989213800"
wdt:P11686 "981058514120106706"
wdt:P1207 "n95403138"
wdt:P1225 "10568282"
wdt:P12385 "edward-mills-purcell"
wdt:P1263 "772/000099475"
wdt:P1280 "30352739"
wdt:P1284 "00000005947"
wdt:P1296 "0053401"
wdt:P12984 "11566"
wdt:P13049 "140990437"
wdt:P1315 "1275986"
wdt:P1343 Armenian Soviet Encyclopedia, vol. 9
Physicists: Biographical Dictionary
Georgian Soviet Encyclopedia
wdt:P13591 "person/b3341038-655c-4131-a9f0-bd5379820a7a"
wdt:P13613 "173299"
wdt:P1368 "000016257"
wdt:P1411 Nobel Prize in Physics
wdt:P1412 English
wdt:P1417 "biography/E-M-Purcell"
wdt:P14178 "mzk2012711698"
wdt:P14541 "4H5bFk"
wdt:P1556 "purcell.edward-mills"
wdt:P1559 "Edward Mills Purcell"@en
wdt:P1580 "a1279864"
wdt:P166 Oersted Medal
Foreign Member of the Royal Society
Karl G. Jansky Lectureship
Max Delbrück Prize in Biological Physics
Nobel Prize in Physics
Fellow of the American Academy of Arts and Sciences
Richtmyer Memorial Lecture Award
National Medal of Science
Beatrice M. Tinsley Prize
wdt:P1695 "a0000001732573"
wdt:P18 <http://commons.wikimedia.org/wiki/Special:FilePath/Edward%20Mills%20Purcell.jpg>
wdt:P1801 <http://commons.wikimedia.org/wiki/Special:FilePath/Green%20Banks%20-%20Ewen-Purcell%20Horn%20Antenna%20info.jpg>
<http://commons.wikimedia.org/wiki/Special:FilePath/Green%20Banks%20-%20Ewen-Purcell%20Horn%20Antenna.jpg>
wdt:P184 Kenneth Bainbridge
Henry DeWolf Smyth
wdt:P185 Nicolaas Bloembergen
George Benedek
George Pake
Walter L. Brown
Charles Pence Slichter
Michaēl D. Papagiannēs
wdt:P19 Taylorville
wdt:P20 Cambridge
wdt:P2021 4.0^^xsd:decimal
wdt:P21 male
wdt:P213 "0000000109188853"
wdt:P214 "79085360"
wdt:P2163 "116262"
wdt:P227 "140990437"
wdt:P2381 "24527"
wdt:P244 "n83151128"
wdt:P2650 physics
wdt:P268 "122774706"
wdt:P269 "031589669"
wdt:P27 United States
wdt:P271 "DA00634815"
wdt:P2924 "2332716"
wdt:P2949 "Purcell-2838"
wdt:P3065 "A003716842"
wdt:P31 human
wdt:P3219 "edwards-mills-purcell"
wdt:P3222 "edward-purcell"
wdt:P3348 "199902"
wdt:P3360 "7484"
wdt:P3365 "edward-mills-purcell"
wdt:P3368 "1693694"
wdt:P3388 "192930"
wdt:P3430 "w6jm35sh"
wdt:P349 "00473387"
wdt:P3630 "529337"
wdt:P373 "Edward Purcell"
wdt:P396 "RAVV045160"
wdt:P3987 "1669"
wdt:P409 "36531062"
wdt:P4293 "pe/013916"
wdt:P4342 "Edward_Mills_Purcell"
wdt:P4590 "edward-purcell"
wdt:P463 Royal Society of London
National Academy of Sciences
American Academy of Arts and Sciences
American Philosophical Society
American Physical Society
wdt:P4823 "1302644"
wdt:P4955 "521954"
wdt:P5019 "purcell-edward-mills"
wdt:P5034 "KAC201908679"
wdt:P535 "240145862"
wdt:P5361 "PurcellEdwardM"
wdt:P5375 "17896"
wdt:P5380 "51466"
wdt:P5419 "edward-purcell"
wdt:P549 "14187"
wdt:P569 "1912-08-30T00:00:00+00:00"^^xsd:dateTime
wdt:P570 "1997-03-07T00:00:00+00:00"^^xsd:dateTime
wdt:P6104 WikiProject Scientists and academics
WikiProject Illinois
WikiProject Indiana
WikiProject Mathematics
WikiProject Physics
wdt:P6385 "nauka_i_tehnika/fizika/PERSELL_EDUARD_MILS.html"
wdt:P6394 "a12109198"
wdt:P646 "/m/023c7z"
wdt:P6551 "11603005"
wdt:P6706 "Purcell,+Edward+Mills"
wdt:P69 Harvard University
Purdue University
wdt:P691 "mzk2012711698"
wdt:P7184 "023c7z"
wdt:P7293 "9810591119605606"
wdt:P7305 "3964602"
wdt:P734 Purcell
wdt:P735 Mills
Edward
wdt:P7666 "edward-mills-purcell"
wdt:P7699 "LNB:z6L;=Bi"
wdt:P7902 "140990437"
wdt:P7982 "51130"
wdt:P800 Electricity and Magnetism
wdt:P8024 "59"
wdt:P8179 "ncf12106472"
wdt:P8189 "987007275627205171"
wdt:P8313 "Edward_Mills_Purcell"
wdt:P8349 "43002"
wdt:P8445 "200746"
wdt:P8612 "NA2457"
wdt:P8848 "4168550"
wdt:P8880 "33253"
wdt:P9371 "301275206"
wdt:P950 "XX891273"
wdt:P9626 "1131"
wdt:P9964 "140990437"
wdt:P9984 "981058514120106706"
Download as:
TurtleJSON-LDRDF/XML
data from SPARQL profile: Wikidata