An AIDS health care group targets dating app Tinder and Grindr, a similar site for gay men, in billboards and bus benches offering free STD tests and reminding users about the risks of casual sex.
It's one of the most intriguing questions in science: Could life exist on Mars today? The answer: Quite possibly. Scientists found powerful evidence that briny water flows on the Martian surface.
Researchers have now concluded that the comet 67P Churyumov-Gerasimenko was probably formed when two separate objects collided during the early stages of the solar system.
Over the last 11 years, astrophysicists have been looking for evidence of gravitational waves predicted by Einstein as part of his theory of relativity. But efforts have proven fruitless.
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