Michael Morpurgo, author. A child needs to feel from the very start that she or he is wanted and loved. They should grow up in the soil of affection of care. There is no replacement for that, it is the most important thing.
American bugler in the Navy, 1917. The bugle is a very simple brass instrument. It has no valves or other mechanisms, the only way the player has to control the pitch is changing the shape of his lips. This means that only notes from the harmonic series can be played.
The first recorded surgical operation on a heart valve took place in 1913. Replacement of diseased valves did not take place until 1962, when the first successful biological valves were invented using human tissue from a donor. Ball valves were the first type of mechanical valves and were developed around the same time. Miles Edwards, an electrical engineer who founded a medical device company called American Edwards Laboratories in the 1950s, is credited with co-inventing the first commercially available artificial heart valve.