05_call_and_delegatecall.txt

call
    - low-level contract function call
    - returns boolean. check !
    - no guarantee you are actually calling a contract address
    - creates a new msg/context

delegatecall
    - low-level
    - executes the given contract function without creating a new msg context
    - it has access to caller's state and context (this == caller)

libraries
    - all function calls to libraries are delegatecalls