A postage-size silicon chip could provide new hope for infertile couples. Seminal fluid is placed at one end of the chip and salt water is placed at the other end. The two liquids flow next to each other and tend to stay separated because of a phenomenon called laminar flow. Only the healthier sperm are able to swim down into the salt water, while the dead and disabled sperm are left behind. Semen samples starting with 45 percent healthy sperm comes out up to 98 percent healthy.
