While not poisonous substances, heat and humidity from summer weather can be deadly to pets. Most pets donât perspire like humans, but use their lungs to get rid of excess heat. As the ambient temperature and humidity rise, their ability to cool in this manner fails and they suffer from heat stroke.
Senet is the oldest board game known to exist. Sets have been found in burial chambers from as far back as 3,500 B.C.âincluding four in Tutankhamenâs tomb. Game boards were three squares wide and ten squares long, and sets typically had five to seven pieces for each player.
Recognized by the Guiness Book of World Records as the MMO with the longest play time per player, and easily the oldest game on this list (launching four years ahead of World of Warcraft, way back in 2001), Runescape deserves mention because it's one of the most updated and popular games of any kind on the planet.