what is a wormhole?

Wormholes are solutions to the Einstein field equations for gravity that act as "tunnels," connecting points in space-time in such a way that the trip between the points through the wormhole could take much less time than the trip through normal space.

The first wormhole-like solutions were found by studying the mathematical solution for black holes. There it was found that the solution lent itself to an extension whose geometric interpretation was that of two copies of the black hole geometry connected by a "throat" (known as an Einstein-Rosen bridge). The throat is a dynamical object attached to the two holes that pinches off extremely quickly into a narrow link between them.

This analysis forces one to consider situations...where there is a net flux of lines of force through what topologists would call a handle of the multiply-connected space and what physicists might perhaps be excused for more vividly terming a ‘wormhole’.

John Wheeler in Annals of Physics

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Monday, November 28, 2011

September 5th

September 5 is Teacher’s Day in “India”. It is the birthday of second President of India and teacher Dr. Sarvapalli Radhakrishnan. When Dr. Radhakrishnan became the president of India in 1962, some of hisstudents and friends approached him and requested him to allow them to celebrate 5 September, his birthday. In reply, Dr. Radhakrishnan said, “Instead of celebrating my birthday separately, it would be my proud privilege if September 5 is observed as “Teachers Day”.

This is not a holiday in India. It is considered a “celebration” day, where teachers and students report to school as usual but the usual activities and classes are replaced by activities of celebration, thanking and remembrance. At some schools on this day, the responsibility of teaching is taken up by the senior students as an appreciation for their teachers.

Traditionally,people in India have given tremendous respect and honor to teachers. An old Indian saying (usually taught to children), ranks teacher in the third place, even before God: “‘Maata, Pitha, Guru, Daivam’”, meaning Mother, Father and Teacher is God.

There is a difference between the spiritual teacher and a material teacher. For spiritual teacher, who causes to remove all the illusions from the mind of his disciple and makes him feel the precence of God, there is another saying in the form of a couplet (doha), which goes, “Guru Govind doou khare kake lagon paai? Balihari guru aap ki Govind deeo batai,” Meaning “I am in a fix whom to salute first: the teacher or the God. I shall choose the teacher as he is the one who is instrumental in me knowing the God”. Further, a central piece in Hindu scripture reads “Gurur Brahma, Gurur Vishnu, Guru devo Maheshwaraha - Gurussaakshaath param brahma tasmai shree gurave namaha,” which translates as “The Guru (Teacher) is the Lord Brahma (the Creator), the Guru is the Lord Vishnu (the Preserver), the Guru is the Lord Shiva (the Destroyer). The Guru is the Supreme Brahman (Ultimate Reality) visible to our eyes. To that Guru we offer our salutations”

There were always some confusions between a spiritual teacher to a material teacher. But these two are not at the same level and one must make sure that how to treat them individually.

Teacher’s Day Celebration

All across the world, Teacher’s Day celebrations are undertaken to commemorate the teachers for their efforts. By having celebrations on Teacher’s Day we convey the message that we care for our teachers. Celebrating Teachers Day is recognition of the devotion with which teachers undertake the responsibility of educating a child.

Teacher’s Day is one of the occasion on which teachers are praised. On this day, school students dress up like their teachers and attend classes acting like their teachers. As the day passes the students perform the activities that are performed by the teachers. Sometimes the teachers also sit in the classes acting like students, reliving the time when they, themselves, were students. This goes a long way towards creating an understanding between the teachers and their students.

Apart from being the day when we give recognition to our teacher’s hard work, this day enables a healthy interaction between students and teachers. However simple the celebrations may be, they reflect the fact that we care for our teachers. So, we should never forget to celebrate this special day for our teachers. There are many ways of celebrating Teacher’s Day. So, how to celebrate Teachers’ Day is to be decided by you.

Teacher’s Day

Teachers have an influencing role in the life of a student. They are like beacons of light guiding us in the formative years of our life. A teacher moulds us and in the process shapes our future. What we learn from our teachers remains with us throughout our life giving us direction. But very often, we fail to show our appreciation and gratitude for their devotion. Teachers do need encouragement and support from the community to feel that their efforts are being recognized. Towards this end only,

Teacher’s Day is celebrated throughout the world. By celebrating National Teacher’s Day we thank our teachers for providing us their invaluable guidance.

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