¡Celebrando el 1 de diciembre! Es Navidad otra vez

Finding the Area of a Triangle in a Rectangle

Acids and Bases Calculations for Grade 11 and 12

1. He said that before the industrial era, nobody slept 8 hours in one block. People slept in two parts: they went to bed after sunset, woke up around midnight, stayed awake for 1–2 hours, then went back to sleep. This “split sleep” was normal for thousands of years. But when factories appeared in the 19th century, society forced everyone into one long sleep window — and the body never fully adapted. He said the modern schedule confuses the brain: it doesn’t understand when it should rest and wh

1. She explained that when a child walks out of school, their brain is still in survival mode. The amygdala, flooded with stimuli — noise, peers, correction — hasn’t shut off yet. “Parents think they’re greeting a rational child,” she said. “They’re greeting a storm.” Those first 12 minutes are the bridge between chaos and home. Interrupt the transition with questions, and the bridge collapses. 2. Her research followed 80 families for one month. When parents began conversations immediately after