One of Aaryan Shukla's world records is for mentally adding 100 four-digit numbers in 30.9 seconds. Reading time 2 minutes Remember when your teachers used to say that mental math is important because ...

Watch Aaryan set a new record for the fastest time to mentally add 200 four-digit numbers. Russian tanker Eco Wizard erupts in blasts, toxic ammonia leaks spark emergency The sleeper train holiday to ...