"The human brain has 86 billion neurons connected by roughly 100 trillion synapses, making it one of the most complex objects in the known universe. Each year neuroscientists make fascinating, important and downright strange discoveries about how this resilient structure works, and 2025 didn't disappoint. Here are 10 of the most fascinating brain discoveries of this year for your own brain to noodle on."
"Brain scans of thousands of people revealed that the human brain has five distinct eras, with turning points in the way it is organized occurring at age nine, 32, 66 and 83. Across each of these stagesfor example, the adolescent period between age nine and 32people's brains tend to experience the same types of changes. Missing Memories You don't remember being a newborn or even a toddler."
The human brain contains roughly 86 billion neurons and about 100 trillion synapses, producing immense structural complexity and resilience. MRI tractography can represent general wiring patterns across developmental eras, including an adolescent phase. Large-scale brain scans reveal five distinct organizational eras with turning points at approximately ages nine, 32, 66 and 83, and similar types of changes occur across individuals within each era. Infant hippocampi can store memories once babies reach about one year old, even though those memories are often inaccessible in adulthood. Newborns display very high levels of tau protein, which stabilizes cell structure but can undergo chemical changes associated with Alzheimer's in adults.
Read at www.scientificamerican.com
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