In their 2018 annual report, Altium (which is primarily known for their electronic design software; they're also a sponsor of The Prepared via Octopart) disclosed that they had acquired PCB:NG (which does quick-turn PCBA that's partially enabled by eliminating stencils and using solder paste dispensers + a bunch of software instead). This is an interesting acquisition: An engineering software company buying a contract manufacturer.
Buffer, which from an openness & funding strategy perspective is really the most remarkable software startup around, spent $3.3M to buy out their large series A investors. The combination of foresight and luck here (namely, including the downside protection clause in their series A) is pretty impressive.
A good update on the state of funding strategies (VC vs. self-funding) for direct to consumer hardware startups.
Léon Theremin, the inventor of the eponymous musical instrument, also invented a piece of Soviet spy apparatus called The Thing. The Thing was a passive covert listening device hidden in a hand carved Great Seal of the United States, which was powered by a strong electromagnetic signal from the outside. "When the Russians knew that an important meeting would take place, they parked an unmarked van in the vicinity of the residency and illuminated the bug. A receiver, tuned to the bug's resonant frequency, was then used to pick up the conversation in the ambassador's office."