Project 1 note:  Yeah, I haven't finished grading it

A function to make turtle graphs?

Review/Expanded side note:  What's a memory address?´
	- 64 bits on modern hardware
	- 32 bits in the past
	- C demo:  print addresses
	- In C, we can say an address holds any type
		+ For example, a function!
	- functions have addresses in the code block
	- printing out a function in Python

While we've got a C program:  Main functions

Types in Python:  Now with functions!
	- Memory addresses, and many types are the same

Scope and blocks
	- global (you get to use these tomorrow)
	- local variables created in functions

Functions can call other functions
	- or themselves...

A couple function puzzles
	- Project 2 is function puzzles
	- Let's make some puzzles!

Good function design:
	- Well-defined purpose
	- Parameters adapt the function to different situations

Debatable function design:
	- Feel free to do these things if you have a good reason
	- Must be defined in a particular spot
	- Uses global variables
	- Interacts with the user

Common Function Pitfalls:
	- Asking for user input in addition to function parameters
		+ ONLY ok if that is the functions' purpose
	- Printing instead of returning values
	- Printing AND returning values
	- Trying to use local variables outside the function
	- Duplicating the function instead of using parameters

Demos:
	Concrete balls
	Lookup table for volume
		- With tracking and noise functions