In this experiment our Resident Scientist Dr. Albert conducts further investigations into the principles of trade.
The investigation was carried out with a vending machine which is programmed to take 3 balls before opening a mechanical door to a compartment with a large toy, filled with treats.
Here, Dr. Albert shows that a scientist must be persistent, as even if the first (first ball) and second try (second ball) fail (no food), the next try could lead to the success.
After multiple experiments Dr. Albert established the fact that 3 is a key number for this machine (he also become a bit fat!).