A 16-year-old wanted to find the most effective way to hide blood after splattering it everywhere. So she put a few drops of cow’s blood on several pieces of cotton cloth and used three kinds of cleaner to wash the cloths.
When NASA’s Orion crew module re-entered Earth’s atmosphere in 2014 tests, it did so covered in 180 small squares of an advanced heat-shielding material called Avcoat. Now, NASA’s research scientists are inspecting them to find out how they worked. Yes, that does appear to be a vacuum cleaner. Read more >>