News
-
MathHow geometry solves architectural problems for bees and wasps
Adding five - and seven - sided cells in pairs during nest building helps the colonyfit together differently sized hexa gonal cells , a new study shows.
-
ArchaeologyThe oldest known horseback riding saddle was found in a grave in China
The well-used saddle, dated to more than 2,400 years ago, displays skilled leather- and needlework. Its placement suggests its owner was on a final ride.
By Bruce Bower -
Health & MedicineMany sports supplements have no trace of their key ingredients
A chemical analysis of 57 supplements found that 40 percent had undetectable amounts of key ingredients.