Heat causes chemical reaction so that might be a way in which people use chemical properties to separate one substance from another substance .
raise hand in a friendly manner, wave, force a smile, nod and make eye contact for a split-second before purposefully making themselves busy with something else to avoid beginning conversation and real human connection and interaction
Answer:
3. 3-D Printing.....You probably didn’t know that what’s now known as 3-D printing began in the early 1980s with a process called selective laser sintering. University of Texas alum Carl Deckard began inventing the process, commonly referred to as SLS, while he was still a graduate student.
Explanation:
Congress passage of a tax cut.
