| Hint | Engineer |
| The first person to discover x-rays | |
| First to experiment with cryogenic engineering | |
| Came up with the Polyphase system that is used in hydroelectric plants | |
| Built an earthquake machine that nearly demolished an entire neighborhood when it was turned off | |
| Discovered the resonant frequency of the earth | |
| Invented the remote control | |
| Invented wireless communication | |
| | Hint | Engineer |
| Invented electrical system called Alternating Current | |
| Came up with the idea of Radar in 1917 | |
| Held patents that helped in the invention of the radio and the transistor | |
| Invented the modern electrical motor | |
| Invented neon lighting | |
| First person to record radio waves from outer space | |
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