Study: Mexican jumping beans use random walk strategy to find shade

Abstraction: Moth larvae in Mexican jumping beans navigate heat via random walk

Key points:

• Physicists at Seattle University published in Physical Review E showing jumping bean movements follow a random walk strategy to locate cooler shade
• The larvae inside the seed pods jump by contracting against the shell; the random walk emerges from these probabilistic movements
• Random walk concept traces to Robert Brown's 1827 observation of jittery pollen motion; Einstein's 1905 paper explained it as molecular collisions, confirming atomic theory
• In a random walk, each step's direction is independent of prior steps, so future position is independent of starting position
• The strategy is effective over small, densely-populated areas; during WWII, Brownian random walks modeled escaped-prisoner travel distance
• Applications of random walks include stock market models, population genetics (genetic drift), and neuron firing patterns

Connections: Random Walk · Brownian Motion

Source: https://arstechnica.com/science/2023/02/taking-a-walk-on-the-random-side-helps-mexican-jumping-beans-find-shade/