1 The primary cause of COPD is tobacco smoke (through tobacco use or second-hand smoke).  The disease now affects men and women almost equally, due in part to increased tobacco use among women in high-income countries.
Swarming is the process by which a new honey bee colony is formed when the queen bee leaves the colony with a large group of worker bees. In the prime swarm, about 60% of the worker bees leave the original hive location with the old queen. This swarm can contain thousands to tens of thousands of bees.
When bees or other insects swarm, they move or fly in a large group. 1  A dark cloud of bees comes swarming out of the hive. 2  People swarmed to the shops, buying up everything in sight. 3  A swarm of people encircled the hotel. 4  Today at the crossing there were swarms of tourists taking photographs.