No one knows how or why magnets attract and repel.
From the March, 2008 Scientific American: "Then there was the study that questioned the efficacy and purpose of the intensive screening of travelers at airports. The researchers, from Harvard University, the Massachusetts Institute of Technology and the Washington University School of Medicine in St. Louis, note that no scientific evaluation has ever been done of the 'screening tools currently in place.' They ask the arch yet brief question, 'Can you hide anything in your shoes that you cannot hide in your underwear?' And they point out that spending on 'airport security ($9 per passenger) is 1,000 times higher than for railway security ($0.01 per passenger), even though the number of attacks on trains is similar to that in planes.' Which, they explain, is 'analogous to committing mammography resources to screen only the left breast.' "
Also: "In a short item entitled 'A Day in the Life of a Doctor: The Power Point Presentation,' two British physicians reveal the 'the main purpose of a PowerPoint presentation is entertainment. Intellectural content is an unwarranted distraction.' They go on to advise that 'the more lines of writing that can be coerced onto a slide and the smaller the font, the lower the risk of anyone criticising any data which has accidentally been included' and that 'the number of slides you can show in your allotted time is inversely proportional to the number of awkward questions which can be asked at the end.' "
Each day more then 20 million meteoroids enter our atmosphere. Most of them are just egg-size.
Meteoroids are the pieces of 'debris' in the solar system. Once they hit the atmosphere the streak of light they produce is called a meteor, and if they hit the ground they are meteorites. Depending on the composition of the meteor (FeNi vs 'rocky'), an egg-sized meteor would weigh about a pound. Most of them are actually minuscule. The chances of a human being hit by a meteorite is about .0055 per year or about one event every 180 years - thanks to Annie Hodges, we don't have to worry about it for another 100 years.
The word potholes for road holes comes from the time when the raods were not paved. Potters, or people who made pots and things, would go into the road and steel the fine quality clay leaving behind holes. Hence the word potholes.