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频道帖子
How does soap work?
First let's discuss pH. There are acids and there are bases. Acids are 1-7 and bases are 7-14. In the middle is 7, which is neither acid nor base. This is where water lies. We hear about acids dissolving things and that is true, but bases can dissolve the "skin" of the cells of your body. Soap feels slimy because it's dissolving the membrane around your skin cells. This also works for bacteria... it dissolves bacteria as well. That's why soap is a disinfectant.
| 2 |  没有文字... | 115 |
| 3 |  没有文字... | 178 |
| 4 |  没有文字... | 1 181 |
| 5 | https://www.youtube.com/watch?v=VLjdo7nX0d0 | 152 |
| 6 | https://m.youtube.com/watch?v=JPIY9WtMh1w | 162 |
| 7 | Bicycle Repair Manual 7th - Chris Sidwells [2021].pdf | 188 |
| 8 |  🔥Understanding Types of Burns — and Why It Matters
In any emergency or survival situation, knowing how to identify the severity of a burn can help you respond quickly and correctly. This image shows how deeply each type of burn affects the skin and tissue layers.
Normal
Healthy, undamaged skin.
First-degree burn
Affects only the outer layer (epidermis). Skin appears red, dry, and painful — similar to a mild sunburn. Usually heals without lasting damage.
Second-degree burn
Reaches the dermis, the layer beneath the surface. Often causes blisters, swelling, and more intense pain. May require medical treatment, especially if large or located on sensitive areas.
Third-degree burn
Destroys all layers of the skin, often appearing white, charred, or leathery. May be painless due to nerve damage. Requires urgent medical care and likely skin grafts.
Fourth-degree burn
Extends beyond skin into muscle, fat, or even bone. Life-threatening and requires immediate, intensive medical intervention. | 254 |
| 9 |  My daughter and I dove the Eagle off the Florida keys. https://www.scubadiving.com/dive-islamoradas-crown-jewel-eagle . It is in 110ft of water. We went down hand over hand on a rope attached to a buoy marking the site. The tide was changing and the current was quite strong. I let go of the line to swim toward the ship and was swept back away from it.
When you scuba dive below 30ft, you have to perform "safety stops" for decompression as you ascend. When the current was sweeping me away from the ship all I could think about was how many miles I would be away once I got to the surface and if the dive boat could even find me. Fortunately I had the presence of mind to dive down to hte sea floor where the current was "shaded" by the ship itself. I was then able to swim toward the ship and grab on to a hand rail.
You will not ever be able to swim against a strong current. Always find a way to move left/right up/down out of the current. | 222 |
| 10 |  Here are the main types of currents you might encounter:
Rip Currents: These are the most well-known and potentially dangerous. Rip currents are strong channels of water flowing away from the shore. They can quickly pull swimmers out to sea. Recognizing them involves looking for water that appears darker, is choppy, or has debris floating out to sea.
Longshore Currents: These currents run parallel to the shore and are caused by waves hitting the beach at an angle.
Undertows: Often confused with rip currents, undertows occur when a wave rolls back off the beach. They pull water and possibly sand back into the ocean, but they affect only the shallow layer of water on the beach and don't pull you out to deeper water.
Tidal Currents. In some locations, especially in narrow inlets or channels between islands, tidal currents can be very strong and change direction as the tide changes from high to low or vice versa. | 200 |
| 11 |  🏝 Caught in a rip current? No sweat—well, sort of.
Here’s the chill guide to getting out:
Keep Your Cool: First off, don’t freak out. Rip currents won’t pull you under, they just take you for a little ocean ride away from shore.
Go Sideways: Don’t try to beat the current by swimming straight back to the beach—you won’t win. Instead, swim parallel to the shore until you feel the pull easing up.
Just Float: Tired or can't seem to swim out of it? Just lay back and float. Rip currents are strong but not usually very wide. You’ll drift out of it soon enough.
Wave for Help: If you’re stuck or tired, get a lifeguard's attention by waving your arms. No shame in getting a little help! | 186 |
| 12 | Teacher: “Please give me a sentence using these three words: defence, defeat, and detail.”
Student: "When a dog jumps over defence, defeat go first, then detail." | 270 |
| 13 | Also everything that we have been told about salt over the last 60 years has been a lie. What's the first thing they give you in a ambulance after having a heart attack? Saline. What is saline? It is salt water. | 202 |
| 14 |  🥵 Handy guide to understanding dehydration, highlighting why it's crucial to recognize its symptoms early. Catching these signs quickly is key because dehydration can significantly impair your body’s ability to function properly, affecting everything from your physical performance to your mental capacity.
Additionally, the importance of salt, or electrolytes, cannot be understated. While hydration keeps your body water levels balanced, electrolytes like sodium help regulate nerve and muscle function, blood pressure, and fluid balance. When you sweat from heat or exercise, not only do you lose water, but you also lose these crucial salts. That’s why drinking fluids that contain electrolytes, or consuming salty foods in moderation, is essential for maintaining your body's balance and overall health. | 218 |
| 15 |  Super simple condensation trap. Here’s how you pull it off:
1️⃣ Grab a Plastic Bag: Find a large, clear plastic bag. The clearer, the better because you want as much sunlight hitting those leaves as possible.
Find a Leafy Branch: Look for a tree or bush with a bunch of green, healthy leaves. These leaves will release moisture as they breathe, which is what you're after.
2️⃣ Bag the Branch: Carefully cover the branch with your plastic bag and tie it off tightly at the base. Make sure there are no holes; you want to trap all the moisture inside.
3️⃣ Position Your Container: Place a small container under the low point of the bag to catch the water. You can sort of shape the bag to direct the water into your container.
As the sun heats up the air inside the bag, the leaves release water vapor, which then condenses into liquid water on the inside of the bag and drips into your container. | 232 |
| 16 |  🌿 ƬƦΔƝƇƑǑƦMΔƬƟƦ 🌿 | 176 |
| 17 | 🌿 ƬƦΔƝƇƑǑƦMΔƬƟƦ 🌿 | 16 |
| 18 |  没有文字... | 282 |
| 19 | https://www.youtube.com/watch?v=FctRpaleRFc | 282 |
| 20 |  没有文字... | 307 |
