Investors fell in love with electric vehicle (EV) and renewable energy stocks in 2020 and 2021. Dozens of start- ups in these fields went public through reverse mergers with special purpose acquisition companies (SPACs) a few years back. Most of them have now failed or are down significantly from their IPO prices, going through a classic boom-and-bust cycle. Now, they are in the bust. QuantumScape (QS -9.01%) was a quintessential bubble stock from 2021. At one point, the battery technology start-up had a ma ...