Can you remember your life when you were just one year old? It's almost impossible, isn't it?- in fact, we usually remember very little of life before the age of seven. It feels like at that young age, we don't know how to remember things well.
Why can't we remember anything about our lives when we were babies? Scientists have worked hard on this problem for many years. Now, a study in Canada may give us an answer. It is a study about "neurogenesis"（神经形成）. During the neurogenesis, the brain makes neurons（神经元）and cells（细胞），two important things that help us remember.
From the study, we know that when the brain is doing a lot of "neurogenesis", it moves away a lot of things we remember before. So we can't remember things at that time. When we were born, our brain worked very hard at "neurogenesis", our memories（记忆）from that time don't stay with us.
Canadian scientists did some tests on the mouse-some of them young, and some of them older. They found that the young mouse doing neurogenesis had very few memories. For older ones, they found that memories could easily stay.
Paul Frankland, a scientist, said, "We think our studies begin to answer why we have no memories from our earliest years. "But even if science can answer that question, there is till a long way to go before it shows us how to remember them.
