Everyone who isn't underwater or in outer space
You take the total population of the world and deduct how many of them are on the surface of the earth at any given time.
On average, there are about 9,700 planes in the sky at any given time. This number can vary depending on factors such as time of day, air traffic, and geographic location. Flight tracking websites like Flightradar24 can provide real-time information on the number of planes in the air.
It is difficult to determine the exact number of people wearing Converse shoes worldwide on any given day. Converse is a popular brand with a wide customer base, so it is safe to assume that many people are wearing Converse shoes at any given time.
12 unless your teammates are in the pool off to the side
It is difficult to provide an exact number as it constantly changes, but estimates suggest that over 4 billion people are online at any given time around the world. This number fluctuates throughout the day depending on time zones and various factors like daily routines and internet usage patterns.
Everyone who isn't underwater or in outer space
You take the total population of the world and deduct how many of them are on the surface of the earth at any given time.
Too many.
...
I am not on the air anywhere, any time.
a lot
As many as he or she can effectively control
An air conditioning Unit keeps the entire facility cool in any type of weather. This keeps people comfortable and and happy especially in the Summer time.
The record for a freefall formation is currently 400. That said, how many skydivers could be in the air at any one time is limited by the number of aircraft and skydivers that could be gathered. If the area was large enough, enough lift, etc, it could be thousands.
Since it's a global site - there are probably millions browsing the site at any given time.
12,000 at any one time.
How many people are homeless at any time of the year? Simple, depends on where you live, but there are tens of thousands of homeless people around the world.