| # | Title | Name | Town/City | S/C/P | Region | Comment | Date |
|---|---|---|---|---|---|---|---|
| 451 | MR | Stewart Brand | Sausalito | California | USA | View | Sep 03, 2021 |
| 452 | Dr | Hari Chhetri | Oak Ridge | Tennessee | USA | N/G | Sep 03, 2021 |
| 453 | Dr | Ramesh Thakur | Rockville | MD | USA | View | Sep 03, 2021 |
| 454 | Dr. | Kyung-Hwan Han | Okemos | Michigan | USA | N/G | Sep 03, 2021 |
| 455 | Professor | Michael Archer | Maroubra | NSW | Australia | View | Sep 03, 2021 |
| 456 | N/G | Anonymous | Harpswell | ME | USA | N/G | Sep 03, 2021 |
| 457 | Mr | Rajendra Adak | Guwahati | Assam | India | View | Sep 03, 2021 |
| 458 | Dr | Anonymous | Hilton | N/G | N/G | N/G | Sep 03, 2021 |
| 459 | Dr | Andre Nel | HOWICK | KZN | South Africa | Hidden | Sep 03, 2021 |
| 460 | Dr. | Robert Friedman | La Jolla | California | USA | View | Sep 03, 2021 |
| 461 | Dr | Anonymous | Pietermaritzburg | KZN | South Africa | N/G | Sep 03, 2021 |
| 462 | Dr | Anonymous | Umea | Västerbotten | Sweden | N/G | Sep 03, 2021 |
| 463 | Dr. | Michiko Inanaga | Takahagi | Ibaraki | Japan | N/G | Sep 03, 2021 |
| 464 | Dr | Loïc Talide | Umeå | Västerbotten | Sweden | N/G | Sep 03, 2021 |
| 465 | Dr | Sanushka Naido | Pretoria | Gauteng | South Africa | N/G | Sep 03, 2021 |
| 466 | Dr | Maud Quinzin | Boston | MA | USA | View | Sep 03, 2021 |
| 467 | Mr. | Ben Novak | Pisgah Forest | North Carolina | USA | View | Sep 03, 2021 |
| 468 | Dr | Janneke Aylward | Somerset West | Western Cape | South Africa | Hidden | Sep 03, 2021 |
| 469 | Mr | Darren Dasburg | Cary | NC | USA | N/G | Sep 03, 2021 |
| 470 | Dr. | John Davis | Gainesville | Florida | USA | N/G | Sep 03, 2021 |
| 471 | Mr | Eduardo Rodriguez | Umeå | Västerbotten | Sweden | N/G | Sep 03, 2021 |
| 472 | Dr. | William Powell | Syracuse | NY | USA | N/G | Sep 03, 2021 |
| 473 | Ms | Nette De Ridder | Ghent | East Flanders | Belgium | N/G | Sep 03, 2021 |
| 474 | Dr | Anonymous | Québec | Québec | Canada | N/G | Sep 03, 2021 |
| 475 | Dr | Bridget Baumgartner | Alexandria | VA | USA | N/G | Sep 03, 2021 |
| 476 | Dr, | Eric Hallerman | Blacksburg | VA | USA | View | Sep 03, 2021 |
| 477 | N/G | Kevin Webb | New York City | New York | N/G | View | Sep 03, 2021 |
| 478 | Miss | Emily Heber | BAKERSFIELD | CA | USA | N/G | Sep 03, 2021 |
| 479 | Dr. | Scott Harding | Athens | Georgia | USA | N/G | Sep 03, 2021 |
| 480 | N/G | Anonymous | Gainesville | Fl | USA | N/G | Sep 03, 2021 |
| 481 | Dr. | Robert Stupar | Saint Paul | MN | USA | N/G | Sep 03, 2021 |
| 482 | Mr | Andrew Newhouse | Syracuse | NY | USA | View | Sep 03, 2021 |
| 483 | Mr. | Drew Kershen | Norman | Oklahoma | USA | View | Sep 03, 2021 |
| 484 | Dr. | Michele Weber | Los Gatos | California | USA | View | Sep 03, 2021 |
| 485 | Dr. | Guo-qing Song | East Lansing | Michigan | USA | N/G | Sep 03, 2021 |
| 486 | Dr. | Pon Samuel | Johnston | IA | USA | View | Sep 03, 2021 |
| 487 | Dr | Todd Jones | Johnston | Iowa | USA | View | Sep 03, 2021 |
| 488 | Prof | Pamela Weathers | Stow | MA | USA | View | Sep 03, 2021 |
| 489 | N/G | Tanner Cook | Ankeny | IA | USA | N/G | Sep 04, 2021 |
| 490 | Dr. | Anonymous | Johnston | IA | USA | View | Sep 04, 2021 |
| 491 | Dr. | Randall Niedz | Vero Beach | Florida | USA | N/G | Sep 04, 2021 |
| 492 | Dr. | Ahmad Omar | Lake Alfred | Florida | USA | N/G | Sep 04, 2021 |
| 493 | Dr | Juan Acosta | Raleigh | NC | USA | N/G | Sep 04, 2021 |
| 494 | Prof. | Savanah St. Clair Senn | Woodland Hills | CA | USA | N/G | Sep 04, 2021 |
| 495 | Dr. | Keith Redenbaugh | Davis | CA | N/G | View | Sep 04, 2021 |
| 496 | Dr | Anonymous | Gent | – Select One – | Belgium | N/G | Sep 04, 2021 |
| 497 | Mr | Callin Ceriani | Pretoria | Gauteng | Saint Pierre and Miquelon | N/G | Sep 04, 2021 |
| 498 | Dr. | Harold Trick | Olsburg | Kansas | USA | View | Sep 04, 2021 |
| 499 | De. | Mark Walton | Austin | Texas | USA | View | Sep 04, 2021 |
| 500 | Prof.Dr. | Yaroslav Blume | Kyiv | N/G | Ukraine | N/G | Sep 04, 2021 |
- S/C/P - State, County or Province
- Dates displayed in the signature list are based on UTC/GMT
- Anonymous signatures signify people who have chosen not to display their names publicly
- A comment in gray indicates that the signer has hidden their comment from public view