Food safety
How long can leftovers from Tet be stored in the refrigerator?
During Tet, there is a lot of leftover food, making it more difficult to store in the refrigerator as well as increasing the risk of food poisoning if stored incorrectly.
Difficult
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Articles about Difficult
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New technology
Batteries made from this one-of-a-kind material will soon replace lithium-ion batteries in electric cars
Lithium-ion batteries have so many advantages but are very difficult to decompose, causing a great impact on the environment.
Environment
The world's highest 'hidden' waterfall, with a flow equal to 25 Amazon rivers, it is difficult to see it with your own eyes
This waterfall is known as the tallest waterfall in the world, the flow is almost 25 times that of the Amazon River, but unfortunately, it is very difficult to see it wi…
Animal world
The 'most ferocious' bird in the world: A natural enemy of crocodiles, possessing a 'difficult' face that knows how to stay away
Shoebill storks have amazing hunting abilities. Their main food is fish, frogs and reptiles. Notably, this bird is a natural enemy of crocodiles, especially small crocod…
Scientific works
The chicken or the egg came first - the question has the answer
'The chicken or the egg came first' - a difficult and controversial question that has long been answered. But it also brings up more conundrums.
Discover science
The city of a thousand years can't plant a tree: Reward 1 billion for successful 'rescue'
Although people tried many ways, trees still could not grow in this city. The government has offered a huge prize, but it seems
Environment
What are the salient features of the African climate?
Referring to Africa is to aim for a continent with hot temperatures all year round. A continent with many difficult and backward economic development conditions.
Science story
The toughest course in the US military environment, where real-life 'Aquamans' are born
This is said to be the most difficult course of the US military, to practice the ability to dive and perform missions under high pressure.
History
Before there was a clock, people knew how to use candles as an alarm
Waking up every morning for many people is a difficult process, so over time, people have come up with countless ways to wake up at the same time every morning, especial…
Life
11 signs that your partner is lying to you
When a person lies, it can be difficult to tell, and we cannot know exactly what they say is true?
Biology
Ants know how to use tools to 'pave the way' through difficult terrain
Despite having only about 250,000 neurons compared to our 86 billion, ants can still do impressive things when they work together.
Discover science
Kek Lapis Sarawak - The World's Most Complicated Dessert
Kek Lapis Sarawak is a traditional Malaysian cake, famous for both its intricate look and the process it takes to make.
AI - Artificial intelligence
The 'face-changing AI' is hard to distinguish between real and fake
The 'face-changing AI' using artificial intelligence technology is not only fast, but also difficult to distinguish real from fake. Barriers to entry into this technology
Environment
Why is it difficult for planes to take off when the weather is too hot?
Summer is a time when everyone is on the go, but hot weather might not be good news if you're planning to fly.
Scientific application
Technological devices that support users to sleep deeply
As people age, not only is it difficult to fall asleep, but it also takes longer to fall into a deep sleep state.