A: A tropical year is the time (365.242199 days) the earth takes to revolve around the sun once. By having just 365 days in a calendar year, 0.242199 days are lost each year. To correct this error, ...

The crisp new dollar bill that I have just taken from my wallet bears the serial number 24598176. It’s easy to tell that the number is exactly divisible by 2 but not by 5. Is it divisible by 3? by 4?

Over the course of centuries, a calendar with no leap years would eventually become totally out of sync with the seasons as we know them. Let’s see what would happen. Leap years exist because we need ...

We’ll send you a myFT Daily Digest email rounding up the latest Albert O. Hirschman news every morning. The economist Albert O Hirschman loved to reintroduce forgotten historical thinkers in his ...

The conclave at Thiruvananthapuram was attended by Bhatti Vikramarka Mallu (Deputy Chief Minister, Telangana), Krishna Byre Gowda (Revenue Minister, Karnataka), Sardar Harpal Singh Cheema (Finance ...

Randomly scramble the digits 0, 1, 2, 3, 4, 5 and 6 to form a seven-digit number (or a six-digit number if the leading digit is 0). Rank the following events in order ...

It’s easy to tell if a given whole number is divisible by 2. Just check whether the last digit is even. There are also simple rules to determine whether a number is ...