What makes you look different than your brother? DNA. What makes your eyes blue? DNA. What makes your hair so curly it's a waste of time to comb it? DNA. DNA ,makes us different than anyone else. OK, you have about forty secret twins in the world. It's a fact. But still, you are a unique person, created and designed by God. Some people may look like you, but there are probably some differences you don't notice because they're so small. Your DNA is unique to you, though. No one has DNA like yours. Here's an example of how unique you are. If you took one man and one woman (hypothetically speaking) you could have more combinations of genetic information than there are atoms in the universe.
Here is what scientists do to use DNA to solve a crime. They usually don't have too much to work with, DNA being so small, but they probably have something like a piece of hair.
1. Prepare the sample. (That takes a lot of work, but it's too much to go into here.)
2. They divide a special gel into columns, called lanes. They place a DNA sample at the beginning of each lane.
3. An electric current is applied. The DNA fragments move independent of each other. This causes each sample to separate into a series of bands.
4. A match of the DNA is made when the bands in a lane of known and a lane of unknown DNA match. This comparison can be made with a computer or done visually.
As I said earlier, DNA is unique to you. If you ever feel like you look like everyone else, think about that, and remember we're all unique in God's eyes, even if it does feel like we were all made in a photocopy machine.