Throughout life our brains undergo more changes than any other part of the body. These can be broadly divided into five stages, each profoundly affecting our abilities and behaviour.
Gestation.....Part 1 of our special feature looks at how a good prenatal environment is needed to make the best out of the growing brain.
Childhood.....Part 2: Life experiences in these early years help shape our emotional well-being, but neglect or harsh parenting may change the brain for good.
Adolesence......Part 3: Teenagers are selfish, reckless, irrational and irritable, but given the cacophony of construction going on inside the adolescent brain.
Adulthood.......Part 4: The peak of your brain’s powers comes at around age 22 and lasts for just half a decade – but there is an upside to the ageing brain.
Old Age......Part 5: Not everyone ages in the same way, but what’s the difference between a jolly, intelligent oldie and a forgetful, grumpy one? And can we improve our chances of becoming the former?
Answer:
1920s and 1930s,
Explanation:
it's worth reiterating that helmets were not mandatory. That wouldn't happen until 1943. During the 1920s and 1930s, variations of the leather helmet appeared, but in 1939, the game changed –or at least became safer– when John T. Riddel introduced the first plastic helmet
<span>In the infant and then in the baby, brain growth is not over, it needs space to grow over months. These cartilaginous spaces allow the brain to take on the full scale it needs.
The ossification of fontanelles varies from one child to another. Indeed, the volume of the skull reaches its adult size between 18 months and 3 years. <span>It is at this age that the bones will gradually weld, which will lead to the disappearance of fontanelles.</span></span>
