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秀滿清樹

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249. Brendan Chau 10
250. Mike Restuccia 9
251. 秀滿清樹 9
252. Piotr Pastusiak 9
253. Zee 9
last 3 solved tasks
Find the logic behind the numbers and then find the missing number.
Find the pattern to determine what the missing number is.
Solve this number puzzle. What will be the missing number? (6, 15, 28, 45, ??)

Photofinish camera

In 1936, the first photofinish camera was installed at a U.S. racetrack. The electric eye was used for races at Hialeah, Florida.

Ballpen in space

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.
To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300 C.
The Russians used a pencil.

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