You probably own lip gloss you’ll never use. Turn that goop into science ammunition. Test if old makeup grows bacteria. Swab your lip gloss tubes, your blush brush, and your friend’s mascara wand. Grow the gunk on petri dishes with agar.
Here’s the twist: test which natural ingredients kill the bacteria. Add a drop of honey, turmeric, or even garlic juice to the samples. Watch the germs die in circles. This is called the “zone of inhibition,” and it makes your project look super professional.
The funny detail
One study found that 90% of makeup sponges are covered in deadly bacteria—even E. coli. You can say “I literally weaponized my sister’s abandoned lipstick.” The judges will cringe and applaud. And you’ll never share makeup again—gross fact for life.
