Article 3NF4T Did you solve it? The puzzle with a twist

Did you solve it? The puzzle with a twist

by
Alex Bellos
from on (#3NF4T)

The solutions to today's puzzles

On my puzzle blog earlier today, I set you the following puzzles:

1) What is numerically interesting about April 25, 1849 - the date of birth of the German mathematician Felix Klein - and why is this year's anniversary particularly noteworthy?

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