Ultrasound is beyond the range of human hearing, above about 20,000Hz. We all know dogs can hear ultrasound but did you know that they can hear rats laughing?
Monthly Archives: June 2008
Stop motion hot air balloons
Hot air balloons are an excellent demonstration of forces due to differences in density. The less dense hot air inside the balloon causes a buoyant force (upthrust) due to Archimedes’ Priniciple.
Coffee!
Update: Litmus has more (much more) on the science of coffee.
As you may know, I love coffee. So any scientific work to improve coffee is okay by me.
