Hot USA Reddit topics:

• Colorado Scientists (US) have found a promising group of materials for tomorrow's super-efficient solar cells, creating two-for-one energy from photons. This process of "singlet fission" could potentially be used to extract more energy from each absorbed photon than in a traditional solar cell.
• 97,000 children tested positive for Covid-19 in 2 weeks as more schools plan to reopen
• 84 arrests, 226 citations and 18 crashes reported in 24 hours at massive motorcycle rally in South Dakota