For those who never encounter them, mud wasps make mud incubating cocoons for their young, then kill or stun other bugs, pack them as food inside, lay their eggs and seal the exit of the mud cocoon with more mud as they leave.  When the eggs hatch the table is ready-set for the young hatchlings who then exit by burrowing out of the mud cocoon to start the cycle all over again.

Hegner scroll saws use an air pumping bellows situated under the bottom arm which pumps air through tubes and pipes to where the blade is cutting and blows dust and shavings away from the cut.