This is a stump damaged by carpenter ants - but it could just as easily be the beam of your house. Carpenter ants chew away the wood in your house while they make the tunnels of their colony. You can often see the "saw dust" they leave behind.
Lengthy article about bee and wasps stings, effects and treatment.
Both bees and wasps sting. Honey bees have barbed stinger that become lodged in the skin. A single honey bee can only sting once. A wasp has a smooth stinger which can be used to sting repeatedly. Poeple may be ellergic to either bess or wasps, although they are different allergies.
This is a paper nest created by wasps. The queen begins the nest and the workers complete it as they hatch. These nests can become bigger than a basketball. All wasps including, hornets and yellowjackets create paper nests. Most wasps create their nests clinging to a structure, whereas yellowjackets build their nests under ground.