Electroweak epoch begins: The Universe cools down to 10˄28 kelvins. As a result, the Strong Nuclear Force becomes distinct from the Electroweak Force. A wide array of exotic elementary particles result from decay of X and Y bosons which include W and Z bosons and Higgs bosons.
Hardon epoch begins. As the universe cools to about 10˄10 kelvins, a quark-hadron transition takes place in which quarks bind to form more complex particles. This quark confinement includes the formation of protons and neutrons, the building blocks of atomic nuclei.
The 2017 Central Mexico earthquake occurred just two hours after an earthquake drill done yearly on the anniversary of the 1985 Mexico earthquake. Widespread damage was caused in Mexico City, Morelos and Puebla. Many buildings collapsed. 370 people were killed (228 in Mexico City, 74 in Morelos, 46 in Puebla, 15 in Mexico State, 6 in Guerrero and 1 in Oaxaca) and more than 6,000 injured.