Past Time #4 hits stores Wednesday as Henry Hayes faces his biggest challenge yet - impressing a scout when there's only one spot available.

For nearly a century, scientists around the world have been searching for dark matter—an invisible substance believed to make ...

Special relativity teaches us that there is no invariant total ordering of events in space-time; different observers can disagree about which of two events happened first. There is only a partial ...

Gov. Greg Abbott has until midnight to sign bills from the recently completed legislative session ...