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Wildfires increase winter snowpack however that is not necessarily mean it is helping the environment

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Eating red meat and processed meat increase the heart disease

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Coping with climate change: limited behavioral responses to hot weather in a tropical carnivore

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Artificial DNA could diagnose endocrine disorders

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Can Your Testicles Taste?

Can you find research articles on this topic? You need 4 sources in the final PSA, including the main source.

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Virus vector as platform of gene therapy delivery

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Transparent solar cell has the potential to change the world

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Should we follow ketogenic diet

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What is the relation between the colour and antioxidant capacity of fruits and vegetables?

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Effects of caffeine and alcohol use on semen parameters and in vitro fertilization outcomes of male fertility patients

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Why is chicken breast so chewy? This may not because of your cooking skills!

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Can coffee lower the risk of cancers?

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The first image of the black hole
Your topic looks like your PSA is going to explain some factual information. When you look for a main source, try to look for one which involves experiments, tests, or data collection. When you find a main source, do you understand the main findings? It is important that you understand the main findings and know what "scientific knowledge" you are going to pass to your PSA readers. Do not just describe what blackhole is or explain some factual information.

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Proliferation of dormant cancer cells
Try to refine the topic to make your topic more specific. It looks like you are going to explain the proliferation process of dormant cancer cells. What exactly is the "scientific findings" that you would like to report in your PSA?
Amended topic: A new hope for cancer patients - Scientists have discovered a way in preventing dormant cancer cells from being awaken

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How did new virus hops to humans?
The topic is not clear enough. Try to refine the topic to make it more specific.
Amended topic:
Why are bat viruses so deadly?

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Does eating more spicy food help you live longer?

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Potential harm of Game meat to human
This topic looks like you are going to describe some facts.  Does your main source involve experiments, tests, or data collection? If not, there might be a risk that you don't have enough to write for your PSA.

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How do we prevent mosquito bites?

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How do spiders attract prey?