Apollo 15 Geologic Hammer and Falcon Feather

Origin
These two artifacts were from the famous Apollo 15 video demonstrating Galileo's Theory of Gravity. Commanders Scott dropped a feather and hammer, which hit the ground at the same time and showed that gravity affected all objects equally. They were given to the Warehouse once those nice folks at NASA realized the interesting effects these two objects had.

Effects
Only activating when dropped together, they create an area roughly fifteen yards wide that has the same amount of gravity as the moon, and is devoid of any gases or liquids. Entering without a space suit or something similar is fatal.

NASA gave these to the Warehouse when it became clear that the energy required to lessen the Earth's gravity in a particular spot would manifest into a spike of gravitational pull elsewhere on Earth, which was the cause of several sink holes and airplane crashes, notably Delta Flight 191.