Putting fat or oil on the hull – below the water line – has the disadvantage that all the dirt, even the smallest particles, clings to it, forming in a short time a rough emulsic smear.
Most people would have smiled at the sight of two clowns, in a clown car on their way into town, but not this particular woman.
We passed a little place to-day called Shakerag, which reminded us very much of a little town we passed through in Kentucky called Dogwalk.
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis:[…]. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the “water-oxidizing complex”, made up of manganese atoms and a calcium atom.
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