things you can only do with boys - eviltoast
    • barsoap@lemm.ee
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      4 months ago

      Ackchyually… that’s completely wrong. Frighteningly so, I might add, where has basic education gone.

      Ultrasound are mechanical waves, light is EM radiation. Really slow light is infrared. Really fast ultrasound is… even more ultra ultrasound. Slower ultrasound would be this.