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32 metronomes on a table, all set to the same tempo, but started at slightly different times. But here’s the fun bit — although they begin “out of phase“, after about 2 minutes, they all lock onto the same phase and synchronize!
Explicatia: You are getting sleeeeeeepy….. | Cosmic Variance | Discover Magazine
In timpul aterizarii, avioanele trec la cativa metri de o colina de langa aeroport:
Util de aflat in cazul fotografilor profesionisti:
1. extend your arms straight out and form a small triangle with your hands.
2. Looking through the triangle with both eyes open, frame something nearby (e.g. a doorknob) and place it in the center of the triangle.
3. Then close your eyes one at a time without moving the triangle — your dominant eye is the one that placed the object in the center.
-PetaPixel: A Quick Trick for Figuring Out Which of Your Eyes is Dominant
O animatie flash care simuleaza dimensiunile universului observabil: de la electron la galaxii: