Difficulty: Easy / Materials: Basic This weather science experiment never fails to impress. Use a stopwatch to measure the difference between the flash and the sound of lightning and thunder, then calculate the distance between you and the strike. Find your way with a DIY compass STEAM Powered...
Fortunately,Online Stopwatchdoes have a few plain timers, too. You can even create your owncustom countdown timerby choosing a timer, the ending sound, and other features. Which online timer is your favorite? How do you use timers in your classroom? Share with a Friend:...
–Many teachers have told me that they use the built-in timer on their Smartphone as a count down or count up timer. The obvious problem with using this strategy is that you have to have your phone on and you may receive calls or text messages during instructional time which is a no-...