The Cool Down on MSN6d
Scientists stunned by rare sighting of creature thought to be extinct for decades: 'A remarkable discovery'
"This species might just stand a chance of recovering." Scientists stunned by rare sighting of creature thought to be extinct ...
Hackaday4y
What Does The Bat Say? Tune In With This Heterodyne Detector
The bat detector (and an insight to the beauty of German language, where a bat is a flutter mouse) The detector is made with a 555, an MCP6004 op amp, and a 4066 analog switch — along with a ...