شب ها در جزیره ی Vaadhoo شما می توانید پدیده ی طبیعی "نور زیستی خالص" را نظاره گر باشید.
عامل ایجاد این پدیده phytoplankton است.
این عکس شگفت انگیز مربوط به خلیج Alaska است و ظاهرا به دلیل ذوب بخچال ها که نمک کمی دارند و به دلیل تفاوت در غلظت ایجاد می شود.
Did you know there is one women whose cells have been multiplied in laboratories across the world? If we weighed all the cells that have come from this one women they would weigh as much as 100 Empire State Buildings. This women's name is Henrietta Lacks and her cells called "HeLa" have been used in many of the greatest scientific discoveries or our time. Her cells have been used to study gene mapping, curing polio, developing cancer drugs, studying AIDS, lukemia and the list can go on. Her cells were even send up to space in a satellite to help us determine if human tissue could survive there.
Henrietta Locks was a poor black women who died of cancer in 1951 when she was just 31 years old. During her treatment, and without her knowledge, a sample of her tumor was send to a doctor at John Hopkins. This doctor had been trying to grow human tissue. They discovered that Henrietta's cells, unlike other human cells, could live and replicate outside the body. If you give her cells nutrients they will live and survive and replicate for what scientists believe is forever. Even if they are frozen and then thawed they will continue to replicate.
Henrietta never knew that her cells would become one of the most important tools in modern medicine. She died in poverty and her husband and children didn't know till many years later that her cells would be one of the most important tools in modern medicine.
معدن الماس Diavik واقع در شمال غرب کانادا
700 نفر در این معدن مشغول کارند و سالانه 1600 کیلوگرم الماس تولید می کنند.
این منطقه در سال 1992 کشف شد و سال 2001 ساخت عملیات اجرایی آغاز شد و تولید الماس سال 2003 آغاز شد.
Oobleck is an easy to make substance that has some interesting physical properties. Oobleck is an example of a non-Newtonian fluid. Many common liquids like water and alcohol have a constant viscosity. But it can be liquid when held loosely in your hand, and can also act like a solid if hit more violently. Here on a speaker the differences in sound frequency act on it making it more or less rigid.
How to Make Oobleck
Place 1 cup (8 ounces) of corn starch into a bowl.
Stir in about 1/2 cup (4 ounces) water
(The exact amount is not necessarily important; what is important is the ratio of 2:1 , corn starch to water). Stir until the desired consistency is reached. Add more water to make it thinner or more cornstarch to make it thicker. If you like, you could also add a few drops of food coloring.
(The exact amount is not necessarily important; what is important is the ratio of 2:1 , corn starch to water). Stir until the desired consistency is reached. Add more water to make it thinner or more cornstarch to make it thicker. If you like, you could also add a few drops of food coloring.
Take it out and enjoy playing. Once you're done you can clean up and talk about how much fun it was to make oobleck!
Store in an airtight container or zipper bag.
کلیپ سیال غیر نیوتونی
دریافتپدیده رنگین کمان آتش (fire rainbow) در اثر برخورد نور خورشید با کریستال‌های بزرگ یخی درون ابرها ایجاد می‌شود.
به گزارش ایسنا، ساکنان آریزونا شاهد پدیده نادر رنگین کمان آتش در آسمان این منطقه بودند.
این رنگ های زیبا در میان ابرها که شباهت زیادی به رنگین کمان دارند، اصطلاحا اثر هاله‌ای (halo effect) نامیده می‌شوند.
زمانی که ابرهای سیروس در ارتفاع بسیار بالا قرار می‌گیرند، کریستال‌های یخی درون آنها تشکیل می‌شود؛ برخورد نور با بالای صفحات کریستالی یخ باعث ساطع شدن رنگ‌های زیبایی در میان ابرها می‌شود که از روی زمین براحتی قابل مشاهده است.