Worn joints. Just like the other joints in your body, your neck joints tend to wear down with age. Osteoarthritis causes the cushions (cartilage) between your bones (vertebrae) to deteriorate. Your body then forms bone spurs that affect joint motion and cause pain.
As the user guide explains, kids hardly read (and you canât expect a 3 year old to read!). So you get games which teach you about letters and numbers starting from the real simple ones to others that teach more fundamental things like reading time or guessing colors.
I'm surprised that you think a 3 year old is suppose to recognize all letters and numbers. My daughter will be 4 in March and knows a few numbers and a few letters. She's been going to daycare since she was 6 months. They have homework everyday where they trace letters and numbers.