web | Philip Kiefer | Popular Science | 2021-11-22 | |
web | University of Texas at Austin | phys.org | 2019-10-07 | |
web | Clayton Aldern, Grist | Reader Supported News | 2015-09-09 | |
web | Dauna Coulter | NASA Science News | 2009-10-06 | |
web | AFP | 2005-11-23 | ||
web | Kenneth Seligson | The Conversation | 2019-05-20 | |
web | BBC | 2018-02-02 |