Day to Day 2 Flashcards
Why should one punch a shark in the nose?
possibly the electroreceptors that are located in the nose. however, the nose being so close to the mouth makes it a risky move. Going for the eyes and the gills might be a better option.
electroreception
the ability to detect electrical currents.
How do sharks detect electrical currents?
100s of thousands of electroreceptors dot the skin of their heads. They pick up signals that muscles emit like a beating heart or a twitching fin. This helps sharks target their prey as they swim in.
Why do great whites stick their noses out of the water
Sharks have a very keen sense of smell and air travels faster in air.
Are jet skis bad for the environment?
Until recently, all personal watercraft ran on two-stroke engines. Two strokes are notoriously bad for the environment for several reasons. First, they don’t just run on gasoline; they run on a mixture of gas and oil. Burning oil is even worse for the environment than burning gas, because it doesn’t burn very well.
Second, traditional PWC two-stroke engines are so inefficient they end up dumping up to 30 percent of their fuel into the water unburned [source: BWN]. In a single hour of run time, a 2000-model PWC will dump about 4 gallons (15 liters) of unburned oil and gas into the water. Engines have become cleaner since the EPA required them to comply with the clean air act of 1990
2-stroke pros and cons versus a 4-stroke engine
Pros: (lightweight, simplicity - 30 to 50% fewer parts, easier to clear of water)
Cons: (increased fuel consumption, elevated hydrocarbon emission)
Do giant squids exist?
most of what we know comes from dead carcasses that floated to the surface and were found by fishermen. The species was first recorded live in 2006, after researchers suspended bait beneath a research vessel off the Ogassawara Islands. The squid was 24 feet.
How does a red tide happen?
Man made pesticides and other harmful chemicals are washing into the ocean
Why is ricotta not considered cheese
Cheese is made by heating milk, with leftover whey, and calf rennet so that the milk forms into curds. Ricotta is made entirely from whey. Ricotta comes from the Italian word for “recooked” because the whey is heated again to make ricotta.
curd
a soft, white substance formed when milk sours, used as the basis for cheese.
whey
the watery part of milk that remains after the formation of curds.
rennet
curdled milk from the stomach of an unweaned calf, containing rennin and used in curdling milk for cheese.
curdle
separate or cause to separate into curds or lumps.
rennin
an enzyme secreted into the stomach of unweaned mammals, and in some lower animals and plants, causing the curdling of milk.
Is blue fin tuna what is in sushi?
Yes, but maguro is the more common which includes big-eye and yellow fin tuna. Blue-fin is the most prized, but is controversial to eat because of sustainability issues.
On Monday, a single 380-pound bluefin tuna sold for about $37,500 in the first auction of the year at the Tsukiji fish market in Tokyo. That’s far below the peak price of $1.76 million that a bluefin went for at the same market in 2013, and this year’s price isn’t a good indicator of the supply, or population status.
