Which cells were used in the Apollo space program? What was the product used for?

Explanation

**Step-by-Step Solution:**

1. **Identify the Type of Cell Used:**
The Apollo space program utilized hydrogen peroxide (H2O2) fuel cells.

2. **Understand the Function of the Fuel Cell:**
The H2O2 fuel cell operates by using hydrogen (H2) as a fuel. In this cell, hydrogen undergoes combustion, which generates heat.

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