A mirror can seem deceptively simple. To us, it is an everyday object, useful for checking appearances or watching what is happening behind us. Yet understanding a reflection requires more than seeing ...

If you were to make a case for evidence of extraterrestrial life on Earth, you would probably use octopuses as an example.

Octopuses may be even smarter than we thought. Researchers at Dartmouth found that octopuses can learn to use mirrors to locate food hidden behind them—a skill previously seen only in vertebrates like ...