As many as thirty percent of Americans have allergies, and most of the pollen they are affected by comes from trees planted nearby. Cities could relieve sufferers by planting low-pollen street trees.
Cities could reduce their pollen count by planting street trees that produce very little of it, writes Thomas Leo Ogran, author of the book Allergy-Free Gardening. American cities weren't always hotbeds of springtime sneezing. Rather, he writes, they became much more allergenic in the 60s and 70s when Dutch elm disease killed many of the low-pollen American elms that lined the streets in cities across the country. Their replacements were highly allergenic, and are responsible for the wheezing, drowsiness and watery eyes that we now associate with this time of year.
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We take fewer mental pictures per second.
- Recent memories run in our brains like sped-up old movies.
- In childhood, we capture images in our memory much more quickly.
- The complexities of grownup neural pathways are no match for the direct routes of young brains.
It's not just a case of "what doesn't kill you makes you stronger."
- A new study suggests children who endure trauma grow up to be adults with more empathy than others.
- The effect is not universal, however. Only one kind of empathy was greatly effected.
- The study may lead to further investigations into how people cope with trauma and lead to new ways to help victims bounce back.
It's one of the most consistent patterns in the unviverse. What causes it?
- Spinning discs are everywhere – just look at our solar system, the rings of Saturn, and all the spiral galaxies in the universe.
- Spinning discs are the result of two things: The force of gravity and a phenomenon in physics called the conservation of angular momentum.
- Gravity brings matter together; the closer the matter gets, the more it accelerates – much like an ice skater who spins faster and faster the closer their arms get to their body. Then, this spinning cloud collapses due to up and down and diagonal collisions that cancel each other out until the only motion they have in common is the spin – and voila: A flat disc.
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