Gulls for war
During World War I the British Navy attempted to train seagulls to reveal the presence of German submarines. The idea was to use a dummy periscope "from which at intervals food would be discharged like sausage-meat from a machine". The birds would, hopefully, learn to associate
periscopes with food and would then fly around approaching German submarines, revealing where they were. Initial tests were conducted by Admiral Sir Frederick Inglefield in Poole harbour in Dorset. Inglefield tried to train the birds not only to fly around periscopes, but also to poop on them. Subsequent tests were briefly conducted in 1917, but then the Navy abandoned the idea. One private inventor, Thomas Mills, refused to give up on the idea. Unfortunately for Mills, the development of sonar then made submarine-detecting seagulls unnecessary.
Recycling
Naman Gupta of Noida, India, started a business making teddy bears stuffed with used cigarette butts. He pays ragpickers to collect butts in the street. Then Gupta's employees carefully separate the paper and charred tobacco from the filters, which are thoroughly washed and dried before being used as stuffing.
Protesting everyday annoyances