What is the missing number?
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 45
The first user who solved this task is Thinh Ddh.
#brainteasers #math #riddles
Radioactive synthesisIn 1936, the first radioactive substance to be produced in the U.S. synthetically was radium E, by bombarding the element bismuth with neutrons. This was achieved by Dr. John Jacob Livingood at the University of California at Berkeley. |