Exercises, tagged to whatever learning style gets results, become more complex as performance improves.

FORBES: New Hope For Autism

The learning curve is usually thought of as a gradual incline, with the assumption that as you learn, performance improves bit-by-bit over time.

FORBES: Why to Clean Your Mindset Like Your Closet

"If Odinga's performance improves, as seems likely, and with this decision on the rejected votes, then it's inevitable there will be a runoff, " said Nic Cheeseman, a lecturer in African politics at Oxford University who is an official observer of the election.

NPR: Kenya: Runoff Seems Likely After Ballot Decision