Linus Benedict Torvalds is a Finnish software engineer who is the creator and lead developer of the Linux kernel

In 9 years, father will be 45 and son will be 15. 45 is 3 times 15.

These are prime numbers. 13 is the next prime after 11.

Each machine makes 1 widget in 5 minutes. So 100 machines will make 100 widgets in 5 minutes, working in parallel.

A capacitor stores energy in the form of an electric field between its plates. It doesn't store current or voltage directly.

"Obscure" means unclear or hidden. Its opposite is clear.

The correct preposition after "good" (when talking about skill) is "at".

The pattern is +4, +6, +8, +10, +12... So, 30 + 12 = 42

A claw hammer is used for driving nails into wood and removing them using the curved claw. It’s a common tool in carpentry and general household repairs.

This is the logo of famous energy drink "Red Bull"

“Eloquent” refers to clear, strong, and persuasive speech or writing.

Each number is multiplied by 2 to get the next number (2×2=4, 4×2=8, etc.).

At 3:15, the minute hand is at 3 (i.e., 90°), and the hour hand is slightly ahead of 3. Every minute, the hour hand moves 0.5°, so in 15 minutes, it moves 7.5°. So, angle between them = 90° - 7.5° = 7.5°.

Mokshagundam Visvesvaraya was a legendary civil engineer and Bharat Ratna awardee. His birthday, September 15, is celebrated as Engineers' Day in India.

CrazyEngineers was founded in 2005 to bring together engineers from around the world to share ideas, projects, and innovations.