ESA's Euclid mission is exploring the "dark universe." The space telescope's latest images offer fascinating new insights.

Think you have sharp eyes? Here’s a fun challenge for you! Hidden among a sea of number 5s is a sneaky little number 3—can you spot it? This optical illusion is a real test of your observation skills.

In a river of southern Vietnam, a 3-foot-long creature with “sharp” teeth swam through the murky water — or tried to, at least. Something closed around the wrinkly animal and pulled it toward the ...