صوت مشترک

Things Scientists Created That Most People Never Heard About. 1. . Nikola Tesla tried to send electricity through the air… without wires. 2. B.F. Skinner built a box… that could control behavior using rewards. 3. John B. Calhoun created a perfect world… that collapsed without any enemies. 4. Vladimir Demikhov combined two living systems… into one functioning body. 5. Jose Delgado used signals…