A man is shown doing math on a white board while explaining the process.
Somebody is writing on a white board and talking to someone.
A man is solving a problem on a white board.
A man both verbally and physically explaining degrees of freezing using a dry erase board.
A man shows how to work a problem on a white board on a wall.
A man talks while writing on a white board and using the pen to point things out.
A man is using a marker to write on a whiteboard while he is solving some math equations
A man doing a pod cast writes out some math equations on a white board.
A man standing in front of a white board shows people how to perform various math problems
A man is performing calculations about drinks on a whiteboard.