Mobility aids help you walk or move from place to place if you are disabled or have an injury. You may need a walker or cane if you are at risk of falling. If you need to keep your body weight off your foot, ankle or knee, you may need crutches. You may need a wheelchair or a scooter if an injury or disease has left you unable to walk. Choosing these devices takes time and research. You should be fitted for crutches, canes and walkers. If they fit, these devices give you support, but if they don't fit, they can be uncomfortable and unsafe.
Primate-like Mammals. The first primate-like mammals, or proto-primates , evolved in the early Paleocene Epoch (65.5-55.8 million years ago) at the beginning of the Cenozoic Era. They were roughly similar to squirrels and tree shrews in size and appearance.
By 20 million years ago there were apes, and by 5 million years ago our closest ancestors and cousins, early ape- humans, had split from the other apes. It is not until about 2 million years ago, however, that the first species classified as fully human, Homo habilis (handy human), appeared in Africa.