There are 5 requirements to earn the Brownie "Senses" Badge:
1. Look around.
2. Listen to the world.
3. Put your nose to work.
4. Take a taste test.
5. Touch and feel.
Maya earned this badge while participating in the GSEP "Senses Explorer" program.
From the description:
Put your senses to the test! Learn how your sense of taste, touch, sight, smell, and hearing allow you to perceive the world around you. See what it would be like to lose one of your senses. Explore the human tongue, make your own scratch-and-sniff stickers, and go on a scavenger hunt.