4.5.4 Quiz: Experimental Design
On March 23, 1989, the chemists Stanley Pons of the University of Utah and
Martin Fleischmann of the University of Southampton announced to the world
that they had achieved cold fusion. That is, with a solution of salts in a simple
desktop apparatus, they had caused hydrogen atoms to "fuse," or combine
into hellum atoms. This reaction had previously been achieved only in
hydrogen-bomb blasts and in giant research projects lasting many decades
and costing many billions of dollars.
The two chemists claimed that they had been able to measure the energy
released by the fusion process in their simple setup. The scientific world was
in an uproar, because if this were really true, cold fusion would be the greatest
discovery in 1000 years - a practically infinite source of cheap, safe energy.
However, no matter how hard they tried, no other scientists were able to get
the same results. Pons and Fleischmann had dozens of excuses, but none of
them were shown to have merit. Ultimately, both scientists resigned in
disgrace
What primary principle of experimental design did their experiment foil?!
O
O
O
A. Control
B. Randomization
c. Replication
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explanation:

laughter improves people's emotional and well-being.   kavita khajuria is a psychiatrist and he has defined laughter as " physical expression of humour and joy that has numorous protective qualities." when you feel under stress or sad because you have argued with a person you love, you need to laugh to feel strong enough to face the problems.

when you have an exam , you probably feel under stress. laughing will you release this tension. humour decreases the hormones that cause stress. k. khajuria   says that the brain releases some chemical components when we laugh. these chemical components are called neurotrophic factors and they are very important. they support the neurons in the brain and encourage the growth of new neurons. as a conclusion, you should laugh a lot before giving your exam. laughing will you with your exam and with your brain.

if you are having difficult times with friends or family members, laughing will also you face these problems. alannagh kelly is an assistant psychologist. she thinks that laughter can   make anger and anxiety vanish in the air. laughter can set a new and exciting atmosphere among people and it can make the bonds bewteen people stronger. so, if you are having a difficult time with someone you love, invite him / her to watch a comedy. you will probably make peace.

laugher will certainly protect you against stress and emotional pain. watching a comedy   may be a solution to stress or damaged bonds. " this remedy is fun , free, and best of all, no instructions needed."   alannagh kelly has said in her blog.

what is a central idea of “no filter”? what details develop this central idea? use evidence from the text to support your response. your response should be at least one complete paragraph.