Tag Archives: chemicals

Homemade organic sunscreen with only 4 ingredients

A few weeks ago, I wrote about the best beach and sport sunscreens for your skin, products free of the wrong chemicals and containing the right ones. A solid way to avoid those nasty sunburns.

In the spirit of Zero Waste, and avoiding those plastic bottles, here is an even better product – homemade sunscreen.

 

 

DIY Organic Sunblock

In this episode (of Surf Sufficient) we teach you how to make your own high spf, water proof sunblock from organic and natural ingredients for pennies on the dollar compared to buying it off the shelf.  Ingredients include- zinc oxide (sunblocking agent), coconut oil (soothes and conditions skin), bee’s wax (waterproofing agent), and tea tree oil (soothes and repairs skin and smells good too).

Scientists figure out why sun overexposure makes our skin sore (a sunburn!)

A group of scientists have figured out (at least in part) why overexposure to UV light makes our skin get sore, red and swollen.

It goes like this:

  • You sit out in the sun too long. (As if you haven’t been told.)
  • Inside your skin cells, that little RNA molecule is damaged by UV-B — and its shape gets altered.
  • Damaged skin cells release altered pieces of RNA.
  • The altered RNA can bind to a receptor in undamaged skin cells and immune cells called peripheral blood mononuclear cells.
  • These cells, as a result, start pumping out chemicals called cytokines that induce inflammation.
  • Redness and swelling follow.

That’s not the end of it, though. Even though there’s a short term ramp-up in immune activity during sunburn, later on the immune system is suppressed for a period of time.

 

Learn more: L.A. Times - Ow, sunburn: Scientists figure out what’s going on in our skin

 

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The best beach & sports sunscreens

The best sunscreen is a hat and a shirt. No chemicals for the skin to absorb, no questions about whether the product works, no bogus claims like “sunblock.” (No conventional product blocks out all rays. That’s why the FDA is trying to ban the term. )

But when you can’t avoid exposing your skin to the sun, use EWG’s Sunscreen Guide to find top-rated sunscreens with broad spectrum (UVA and UVB) protection but fewer hazardous chemicals that penetrate the skin.

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The list has narrowed down over 1800 sunscreens to 188 of the best beach/sport options.

Each one contain the minerals zinc or titanium. They are the right choices for people who want the best UVA protection without any chemical considered to be a potential hormone disruptor. None of the products contain oxybenzone or vitamin A, and none are sprayed or powdered.

See if your sunscreen is on the list, or find one to buyEWG Sunscreen Buyer’s Guide 2012

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How do octopuses navigate?

One researcher, Jennifer A. Mather, wondered: how do octopuses navigate? Do they rely on chemotactile sensory information (i.e. movement based on chemicals in the environment), or do they orient towards visual landmarks?

Octopuses occupy “homes” for several days or in some instances for several weeks, and when they go out looking for food, they are sometimes gone for several hours at a time. Therefore, they must use some sort of memory to find their way back home.

Many molluscs use trail-following, and follow their own mucus trails, or the trails of others. You might expect that octopuses use trail-following as well, since they forage by using chemotactile exploration – at least four different types of receptors on their suckers gather chemical and tactile information as they move along the rocky seafloor.

However, many other species use visual scene recognition to aid in navigation: ants, bees, gerbils, hamsters, pigeons, and even humans, use visual landmarks to navigate around their environments. Since octopuses use visual information to distinguish among different objects, they could use visual landmarks to get home as well.

To find out the researchers performed a series of experiments, testing chemicals, memory, and navigation. See what they learned - Scientific American.

 

** The article is kinda long so you can just read the last paragraph for the summary :)

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