You can soothe your nerves using a simple technique called "The Diving Reflex"

What actually is the diving reflex?

The mammalian diving reflex is a reflex in mammals which optimizes respiration to allow staying underwater for extended periods of time. It is exhibited strongly in aquatic mammals (seals, otters, dolphins, etc.), but exists in weaker versions in other mammals, including humans.

In other words, when your body comes in contact with cold water, it automatically responses with:

• Decrease in heart rate by 10 to 25 percent (depending on the coldness)
• Decrease in blood pressure.
• Decrease in other symptoms of stress.
• Purpose of this reflex: The diving reflex is the body's physiological response to submersion in cold water and includes selectively shutting down parts of the body in order to conserve energy for survival.

If you submerge your left arm in ice cold water, you'll experience a reboot in your heart. 

So How can you use the Diving Response?
If you are going to perform e.g. at a competition or at a business event, activating the diving reflex can help you relax. The diving reflex is activated by breath holds and by facial contact with cold water. If you cover your face, especially the forehead and the area around the nose (area of the trigeminal nerve) with a cold wet towel, the diving reflex will be activated. Because the diving reflex innervates the vagus nerve your pulse will drop and your body will relax. In this way you can quickly calm your nerves before a performance.
The maximum response (the braycardia effect) that is, highest reduction in heart rate and blood pressure, can be observed by holding your breath while submerging your face under cold water.

This also a well known ancient Indian technique to reduce stress and tensions

Source : Wikipedia

Staircase have odd number of steps to prevent people from stumbling. Most people are right handed, so they naturally step with right foot first. And if the top stair will be an even stair then the person will be in it's left foot. But the brain is used to of right foot first, so the odd step will put them back on right foot, and there is less of a chance that a person might stumble.

Hence the Staircase have odd number of steps.

Contrary to popular belief, it is not as if a hole was drilled into the pencil and the lead was inserted into it. It is simply two halves being glued together.

Below is the pictorial representation of how a single block of wood is made into pencils:

Here is the top/bottom view of how it would look like:

Here is yet another step-by-step process of pencil making...

It is amazing how Nature has given us hints about food that is beneficial for us in terms of its resemblance to our organs. Following are some examples:

1. Walnut- brain

A Walnut looks like a little brain, a left and right hemisphere, upper cerebrums and lower cerebellums. Even the wrinkles or folds on the nut are similar to those of the neo-cortex. Known as the ultimate “brain food”, Walnuts contain vitamin E, folate, melatonin, omega-3 fatty acids, and antioxidants that work to improve brain function.

2. Carrot – Eye

It is clear that a sliced carrot resembles an eye, it even has patterns of radiating lines that look just like the pupil and iris! Beta-carotene (what gives carrots their vibrant orange colour) helps to maintain healthy eyesight, protects against macular degeneration, and the development of cataracts.

3. Celery-bone

Celery, Rhubarb, Bok-choy and more look just like bones structure. These foods specifically target bone strength. Celery contains silicon, which is part of what gives bones their strength. Here’s an astonishing fact: bones are 23% sodium, and celery is also 23% sodium.

4. Tomato- heart

A Tomato has four chambers and is red in color, so also the heart is red and has four chambers. Research has confirmed that tomatoes are loaded with lycopine and it is indeed pure heart and blood food.

5. Avocado – Uterus

Avocados are shaped like the uterus and cervix, and avocados have been shown to balance hormones and prevent cervical cancer! And guess what? Just as it takes exactly 9 months for a baby to fully develop in the womb, it takes an avocado exactly 9 months to grow from a blossom into a ripened fruit!

6. Sweet potato- Pancreas

A sweet potato has a striking resemblance to the pancreas, and has been shown to help the pancreas do its job by helping to stabilize blood sugar levels and can actually balance the glycemic index of diabetics. Sweet potatoes are also naturally high in Vitamin B6, which studies have shown inhibits the growth of pancreatic cancer!

7. Ginger – Stomach

Ginger looks like the stomach and aids in digestion! Ginger has been used for centuries as a natural remedy for stomach health. Gingerol, the ingredient that gives ginger it’s strong scent and taste, is listed in the USDA database of phytochemicals as having the ability to prevent nausea and vomiting.

8. Grapes – Lungs

Grapes, especially heirloom concord grapes, resemble the alveoli of the lungs. The alveoli of the lungs allow oxygen to pass from the lungs to the bloodstream. A diet high in fresh grapes has shown to reduce the risk of lung cancer! Grape seeds also contain a chemical called proanthocyanidin, which can reduce the severity of allergy-triggered asthma.

9. Kidney beans- Kidneys

Kidney Beans actually heal and help maintain kidney function and are shaped exactly like the human kidneys (hence their name). Kidney beans provide a variety of minerals and vitamins, and so are generally beneficial for your health. If your kidneys are healthy, kidney beans can -- when consumed as part of a balanced diet -- contribute to your kidney health. If your kidneys are diseased, you might need to moderate your intake of kidney beans.

Source : Quora 

Nanotechnology is one of the most popular areas of scientific research, especially with regard to medical applications. It is one of the new detection methods that brings about cheaper, faster and less invasive cancer diagnoses. If scientists can load their cancer-detecting gold nano particles with anticancer drugs, they could attack the cancer exactly where it lives. Such a treatment means fewer side effects and less medication used. Nano particles also carry the potential for targeted and time-release drugs. A potent dose of drugs could be delivered to a specific area but engineered to release over a planned period to ensure maximum effectiveness and the patient's safety.

A Cancer Tumor absorbing nutrients from a blood vessel to survive

Nanotechnology based synthetic spheres projecting light beams on a tumor to detect and cure cancer

• A nightingale’s song can be louder than a chainsaw.
• If you drilled a tunnel straight through the Earth and jumped in, it would take you 42 minutes 12 seconds to get to the other side.
• Humans share 50% of our DNA with a banana.
• If humans were capable of hearing bass frequencies lower than 20 Hz, we would be able to hear our own muscles moving.
• A single bolt of lightning contains enough energy to cook 100,000 pieces of Bread toast.
• Aircraft engines suck in 1.25 tons of air per second on take-off – that’s about the volume of a squash court.