"I have a microscope at home.
Definitely add one to the child
A new way of looking at the world. ”
Two days ago, I was at home to clean up the kitchen and turn over a bag of shrimp eggs for a good year. It was bought after the last time I bought a mysterious shell microscope, because there are not many living creatures in the small river this season, thinking that shrimp can be raised at home in the good year, I bought a large bag for more than ten dollars.
But a single observation is usually only a handful, and the remaining large pile does not know how to consume. Looking at the shrimp eggs in his hand, he asked the rice flower: "Do you know how the shrimp in the harvest year will hatch?" ”
This was not a problem for the rice flower, after all, she had observed the juvenile shrimp of the harvest before, so she knew that her father had mixed it with a salt solution and put it on the heat.
So I asked, "So if it's at room temperature, or if you don't add salt, can it hatch?" ”
The rice flower hesitated, and for the first grader of elementary school, she did not know what the control experiment was.
So I first guided the first condition: "Then we can try the follicles in clean water, and also put them on the heat, so that the only difference from the larvae of the harvest shrimp we have observed before is that if they are salted, we can see if they will hatch." ”
Mi Hua said: "You can also put one without putting it on the heating." ”
I quickly took the opportunity to complete the experiment: "Yes, not on the heating, a cup of salt, a cup of no salt." In this way, we get 4 cups of shrimp eggs. ”
To make sure that the rice flower understood the experimental design, I asked, "What is the difference between two cups on the table and two cups on the heater?" ”
The answer of the rice flower is very satisfactory: "The difference is whether it is salted or not, and whether it is warm or not." ”
Start of the experiment: 0 h
"In this way, control the experiment
The design was successfully completed. ”
The rice blossoms themselves make their marks, from left to right,
HSS: hot sea salt = heating + salt water
SS: sea salt = room temperature + brine
HW: hot water = heating + water
W: water = room temperature + water
In order to make the contact area larger, the salt water and water placed on the heating need to be placed obliquely. From the last experiment, we knew that the shrimp could hatch in just one day, so we didn't cover the cup mouth with plastic wrap.
Salt water and water placed on the heating
Salt water and clean water in indoor conditions
Experiment start: 24H
"Observations from the next day
It's the most interesting. ”
Because none of us had seen how the shrimp hatched in the clear water, I said to the rice flower: "Although we know that the shrimp live in brine, so we speculate that the shrimp should not hatch in the water, but the essence of the experiment is: there is a hypothesis, and then the experiment is designed, the results are observed, and the hypothesis is verified." So we now need to observe without prejudice. ”
Some of the experimental results are in line with expectations: the shrimp in the salt water placed on the heating (HSS: hot sea salt heating + salt water) has hatched densely.
More pronounced in the microscope, countless knotted larvae were seen in the hot brine, and the black dots were the eggs of unhatched shrimp in the harvest.
But what is surprising is that when you look closely at the other cups with the naked eye, there are many things like small parachutes suspended inside, the upper part of the small parachute seems to be a dark complete egg, and the lower half is some pale pink lines, I don't know what it is.
The cup on the right is more obvious because it has just been shaken.
Some observations were made, and it turned out to be the larvae of the harvest shrimp on the side of the egg that came out of the shell but did not swim out of the membrane. The rice blossoms felt that they might not have hatched yet.
At this time, I had another guess. I said, let's take note of the experiment and look at it for another day.
Experiment start: 36H
"On the third day of observation,
A new phenomenon has emerged. ”
SS: Sea salt Inside the room temperature + salt water, there are fewer small parachutes, and there are many abundant shrimp larvae swimming around. In contrast, room temperature water (W: water room temperature + water) and water on heating (HW: hot water heating + water) are still a lot of small parachutes.
The external mobile phone holder of the miao shell microscope is used to record screen shooting experiments, which is amazing!
Mi hua was confused by the sight in front of her.
I said, you see, with or without salt, the eggs of the shrimp in good years will change from a round and slippery state to the stage of a small parachute, that is, the larvae can come out of the eggs.
But what is the difference between having salt and not having salt? Mi Hua said: "There are no shrimp in the water that can swim." ”
An inference
At this point, we can already get a self-justifying inference. We guess that as long as there is water, the shrimp can be soaked out of the shell, but if it is pure water, the shrimp of the harvest can not run out of the membrane, that is to say, they are dead when they come out of the shell.
At this point, a small biological experiment using northern heating is completed. With a microscope at home and a little thought, you can design and complete a complete experimental project with your child.
The mysterious shell microscope has been exaggerated many times before, and it was not until the holidays that I felt that the time of parent-child coexistence really needed such a high-quality power-assisting artifact to achieve: science with baby freedom.
Invert the microscope
Suitable age: 5+
The price after the coupon is ¥350, and the original price is ¥776
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Now, I am more looking forward to the warm blossoms of spring, to be able to fish something out of the river that has just turned green, to let the rice flowers and sister Mi Su look at the details of the "green", and to see how rich the life is hidden in the scale that human vision cannot distinguish.
As a microscope should have the performance and parameters, the performance of the miao shell microscope is also quite good, and then introduce it to you in detail.
40x-320x magnification, clear imaging without eye-catching
The eyepiece uses an all-optical wide-angle lens, and the imaging effect is very clear. There are 10x and 16x, and different magnifications can be used according to the needs.
It is recommended to use a low multiple first, with a wider field of view and easier to find the target. Once adjusted, use a high multiple to observe the details.
Its magnification is 40x-320x, which is a range that is very suitable for children. While the imaging is clear, the observation is also very comfortable.
The double-sided focus wheels are designed to fit the size of the child, and it is easy for the child to grasp the focus.
Double-sided focus wheel + external phone
The whole weight is only 0.9 kg, which is very light to pick up, and the baby can easily pick it up, and even hold it up for her sister who likes to sit on the ground and play.
This way of holding the base of the side wall is also possible
Oversized stage for friendlier operation
An inverted microscope also has the advantage that its stage space is very large. The large size here, in addition to the large area of the table, there is also a large distance from the vertical space.
The thickness of a conventional microscope specimen is limited by the distance between the objective lens and the stage, and too thick is easy to fit in or close to the objective. The inverted microscope lifts this limitation, so that the objects we can observe have many possibilities.
The operating space is very large
With a diameter of 10.5 cm and a vertical distance of 6 cm, it is very simple to put directly into a Petri dish as mentioned earlier, and it is no problem to put in some larger and heavier specimens.
Moreover, it can also improve the efficiency of observation and reduce the difficulty of operation. During conventional upright microscope observation, when changing specimens, the stage needs to be lowered for replacement and then refocused and positioned. Every step here carries the risk of failure.
After adjusting the focus, the specimen does not need to be refocused, and the operation is simple
But with an inverted microscope, changing the sample is a piece of cake, just take it down and put it on the line! Therefore, for children with insufficient patience, such a more "efficient" experience can keep them interested.
Matching specimen set + punch card poster, the experience is more interesting
It has been designed with lots of fun ways to play, making this microscope not only a tool, but also a fun experience for family exploration.
The box comes with 10 sliced specimens of animals and plants, which can first take children to understand the structure of cells and arouse children's curiosity.
Very complete set of exploration tools: 5 blank slides, Petri dishes, forceps, spatulas, reagent bottles, coverslips...
You can take your child to make some simple specimens together, such as the more common human oral epithelial cell packing, blood smear and so on.
Left: Oral mucosal epithelial cells; Right: Blood
Of course, the mobile phone bracket is appropriate, not only can use the camera function of the mobile phone to continue to enlarge the image, but also can record the image taken and recorded.
What's even more fun is that it makes a punch card poster of the objects suitable for observation around it every day, followed by ticks one by one, and everything in the home becomes fresh!
Oversized home observation punch card poster
In the leisure afternoon, take the punch card poster and explore the tiny world of the family with the baby, which is another happy parent-child time!
Now to expose children to these, it is more so that they can broaden their horizons and realize that there are many invisible beauty in life that need to be discovered by human beings.
In the scene exploration again and again, learn to take the initiative to ask questions, take the initiative to observe, and take the initiative to find answers.
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