In 1968, chemist Spencer Silver was trying to make a super-strong adhesive and got the opposite: a weak glue that sticks but peels off without leaving a mark. Nobody knew what to do with it. Six years later, his colleague Art Fry, annoyed that his bookmarks kept falling out of his choir hymnal, thought of coating scraps of paper with it. Post-it notes launched in 1980.
In 1843, inventor Alexander Bain patented a way to send images over telegraph wires using synchronized pendulums. By the 1860s, a commercial fax service was already linking cities. The telephone wasn't patented until 1876, more than three decades after that first fax patent. The fax is really a child of the telegraph age.
On 8 October 1958, in Stockholm, 43-year-old Arne Larsson received the very first implanted pacemaker. The device, designed by engineer Rune Elmqvist and implanted by surgeon Åke Senning, worked for only a few hours and had to be replaced. Larsson went on to receive more than twenty pacemakers in his lifetime. He died in 2001 aged 86, outliving both the engineer and the surgeon.