Kleenex tissues were originally used as filters in gas masks.
46
Whale oil was used in automobile transmissions as late as 1973.
56
Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
The IRS processes more than 2 billion pieces of paper each year.
28
