Solution to bonus riddle: https://brilliant.org/TedEdTimeTravel/
Your professor has accidentally stepped through a time portal in his physics lab. You’ve got just a minute to jump through before it closes and leaves him stranded in history. Your only way back is to grab enough colored nodules to create a new portal to open a doorway through time. Can you take the right amount of nodules to get back to the present before the portal closes? Dan Finkel shows how.
Lesson by Dan Finkel, directed by Artrake Studio.
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