• Number of neurons: 10¹¹

• Number of connections: 10⁴ per neuron

• Neuron death rate: 10⁵ per day

• Neuron birth rate: 0

• Connection birth rate: very slow

Properties of the brain:

• It can learn, reorganize itself from experience
  
  
• It adapts to the environment
  
  
• It is robust and fault tolerant