Graphene Sheets Get Easier To Manufacture
Yes, cooling has got easier but building bif systems and keeping them cold isn't easy. Room Temperature semiconductors may be difficult but what about those at around 75K, the boiling point of nitrogen.
Tech to keep nitrogen liquid (even on big bits of plant) is well known and even relatively cheap.
Wall Street Becoming a Linux Stronghold
What happens is that you get market data as fast as possible, predict what is happening then act on it. If somebody else is faster, they get the deal, you don't. Already some of the biggest electronic exchanges, LSE, Xetra & Eurex offer so-called proximity hosting where you pay $$$ to share the data centre with the exchange.
Yes, the original order may have come from a human but the execution of big orders is via algorithmic trading so that the market isn't adversely effected.