Tofu, contact lens and cartilage

For many people with severely torn ligaments or knee replacements, the ability to run and jump as though they have never been injured before remains a dream. Tissue engineering might lead to the day when damaged cartilage can simply be replaced with synthetic materials that resemble human tissue, giving injured joints new life. In an article published last week in Nature, that day comes closer when a team of eight scientists reported the synthesis of a novel hydrogel that is extraordinarily strong, stretchable and capable of self-healing.