The brain's inexperience in interpreting messages from the weightless ________ causes the space sickness commonly experienced by two-thirds of all space travelers.

Question

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Otoliths are small crystals in the inner ear that are responsible for detecting changes in gravity and movement. In space, where there is no gravity, the otoliths no longer work properly and the brain struggles to interpret the mixed signals it receives, leading to space sickness. The other options (hair cells, Eustachian tube, and cochlea) do play a role in hearing and balance, but they are not as directly related to the issue of space sickness as the otoliths.

The Brain's Inexperience in Interpreting Messages from the Weightless ________