Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
Energy is being wasted if a toaster is left plugged in after use.
21
The United States produces enough plastic film annually to cover the entire state of Texas.
13