NGC 6302 (also known as the Bug Nebula, Butterfly Nebula, or Caldwell 69) is a bipolar planetary nebula in the constellation Scorpius. The structure in the nebula is among the most complex ever observed in planetary nebulae. The spectrum of NGC 6302 shows that its central star is one of the hottest stars known, with a surface temperature in excess of 250,000 degrees Celsius, implying that the star from which it formed must have been very large. The central star, a white dwarf, was identified in 2009, using the upgraded Wide Field Camera 3 on board the Hubble Space Telescope. The star has a current mass of around 0.64 solar masses. It is surrounded by a dense equatorial disc composed of gas and dust. This dense disc is postulated to have caused the star's outflows to form a bipolar structure similar to an hourglass. This bipolar structure shows features such as ionization walls, knots and sharp edges to the lobes. Observation history As it is included in the New General Catalogue, this object has been known since at least 1888. The earliest-known study of NGC 6302 is by Edward Emerson...

Palmistry is the practice of fortune-telling through the study of the palm. Also known as palm reading, chiromancy, chirology or cheirology, the practice is found all over the world, with numerous cultural variations. Those who practice palmistry are generally called palmists, hand readers, hand analysts, or chirologists. There are many—and often conflicting—interpretations of various lines and palmar features across various teachings of palmistry. Palmistry is practiced by the Hindu Brahmins, and is widely viewed as a pseudoscience due to various contradictions between different interpretations and the lack of evidence for palmistry's predictions. History Ancient palmistry Palmistry is a practice common to many different places on the Eurasian landmass; it has been practiced in the cultures of Sumeria, Babylonia, Arabia, Canaan, Persia, India, Nepal, Tibet and China. The acupuncturist Yoshiaki Omura describes...

Charlotte Dundas is regarded as the world's second successful steamboat, the first towing steamboat and the boat that demonstrated the practicality of steam power for ships. Early experiments Development of experimental steam engined paddle boats by William Symington had halted when the sponsor, Patrick Miller of Dalswinton, abandoned the project. Symington had continued building steam pumping engines and mill engines. In 1793 he had developed a drive using a pivoted crosshead beam above the vertical cylinder to transmit power to a crank. Miller's project and Captain John Schank's unsuccessful attempt at a canal steam tug had come to the attention of Thomas, Lord Dundas, Governor of the Forth and Clyde Canal Company, and at a meeting of the canal company's directors on 5 June 1800 approved his proposals on the basis of "a model of a boat by Captain Schank to be worked by a steam engine by Mr Symington". The boat was built by Alexander Hart at Grangemouth to Symington's design with a vertical cylinder engine and crosshead transmitting power to a crank driving the...

Data loss prevention (DLP) software detects potential data breaches/data ex-filtration transmissions and prevents them by monitoring, detecting and blocking sensitive data while in use (endpoint actions), in motion (network traffic), and at rest (data storage).The terms "data loss" and "data leak" are related and are often used interchangeably. Data loss incidents turn into data leak incidents in cases where media containing sensitive information is lost and subsequently acquired by an unauthorized party. However, a data leak is possible without losing the data on the originating side. Other terms associated with data leakage prevention are information leak detection and prevention (ILDP), information leak prevention (ILP), content monitoring and filtering (CMF), information protection and control (IPC) and extrusion prevention system (EPS), as opposed to intrusion prevention system. Categories The technological means employed for dealing with data leakage incidents can be divided into categories: standard security measures, advanced/intelligent security measures, access control and encryption and...