CERN’s Large Hadron Collider is back online and firing test collision-free proton beams after being offline for the last two years while it was being upgraded. Over the next few months, the LHC will be going through tests and will get back to smashing protons.
The upgrade has given the LHC almost twice as much power as it initially had and it will be smashing protons at up to 13 TeV (teraelectronvolts). The LHC will be online only for three years before it will be shut down again. The hope is that the higher power output should help its researchers to do their testing a bit better. In case you forgot the LHC likely discovered the Higgs boson on the initial run before it was shut down for upgrades.