Is it against the law to take money that someone else has dropped?
Yes it can be. The law in England and Wales, and many other countries, is that if you find property which you know belongs to someone else, you must take "reasonable steps" to find the owner. Not doing so can amount to theft, as Staffordshire woman Nicole Bailey found out when she picked up £20 which had been dropped by someone using a cashpoint in a shop. She admitted theft when shown CCTV footage of the incident. She was given a six-month conditional discharge.
Does the attack when a man drove a bus into worshippers at Finsbury Park mosque count as terrorism?