Have a deep view into what people are curious about.

🔗 Engineering 🔗 Chicago

During the 1850s and 1860s, engineers carried out a piecemeal raising of the level of central Chicago. Streets, sidewalks, and buildings were physically raised on jackscrews. The work was funded by private property owners and public funds.

🔗 Death 🔗 Greece 🔗 Paranormal

The term Drosoulites (Greek: Δροσουλίτες) refers to a long procession of visions, seen by residents around Frangokastello castle in Sfakia region of Crete (Greece). The phenomenon is rumored to be visible every year, on the anniversary of the Battle of Frangokastello or even in early June near a small village in southern Crete.

The visions, as described by witnesses, consist of a group of human-like shadows dressed in black, walking or riding, armed with weapons, moving from the monastery of Agios Charalambos and advancing towards the old fort, Frangokastello, a 14th-century Venetian fortification. Legend has it that this group of people are Greek fighters that died during the Battle of Frangokastello (17 May 1828) and since then they appear as supernatural beings in the area.

The ghost army is led by Hatzimichalis Dalianis, from Delvinaki in Epirus, the chief of the Greek men, 350 of whom were lost, in the battle. The army took refuge in the fort during the Greek War of Independence against the Turks, where they were killed after a seven-day siege.

The local people named them Drosoulites ("dew shadows") due to the time of day that the phenomenon takes place. The phenomenon is observed when the sea is calm and the atmosphere is moist and before the sun rises too high in the sky. It usually lasts about 10 minutes.

The shadows are visible from the valley at a distance of 1000 m. Many have tried to explain the phenomenon scientifically, and at one time it was explained as a mirage from the coast of North Africa, but still there is no accepted consensus. On the other hand, another, occult, interpretation implies the existence of a psychic phenomenon, clairvoyance, seen in some countries like Britain and Germany, also regarding ghost armies. The appearance of the Drosoulites is documented over the ages. In 1890 a transient Turkish army took the images for rebels and fled away. Even during the Second World War, a German patrol is said to have opened fire on the visions.

🔗 Computing 🔗 Computing/Early computers

The IBM Automatic Sequence Controlled Calculator (ASCC), called Mark I by Harvard University’s staff, was a general purpose electromechanical computer that was used in the war effort during the last part of World War II.

One of the first programs to run on the Mark I was initiated on 29 March 1944 by John von Neumann. At that time, von Neumann was working on the Manhattan Project, and needed to determine whether implosion was a viable choice to detonate the atomic bomb that would be used a year later. The Mark I also computed and printed mathematical tables, which had been the initial goal of British inventor Charles Babbage for his "analytical engine".

The Mark I was disassembled in 1959, but portions of it are displayed in the Science Center as part of the Harvard Collection of Historical Scientific Instruments. Other sections of the original machine were transferred to IBM and the Smithsonian Institution.

🔗 Ancient Near East 🔗 Ancient Egypt 🔗 Archaeology 🔗 Ethnic groups 🔗 Israel 🔗 Palestine 🔗 Dacia

The Sea Peoples are a purported seafaring confederation that attacked ancient Egypt and other regions of the East Mediterranean prior to and during the Late Bronze Age collapse (1200–900 BCE). Following the creation of the concept in the nineteenth century, it became one of the most famous chapters of Egyptian history, given its connection with, in the words of Wilhelm Max Müller: "the most important questions of ethnography and the primitive history of classic nations". Their origins undocumented, the various Sea Peoples have been proposed to have originated from places that include western Asia Minor, the Aegean, the Mediterranean islands and Southern Europe. Although the archaeological inscriptions do not include reference to a migration, the Sea Peoples are conjectured to have sailed around the eastern Mediterranean and invaded Anatolia, Syria, Phoenicia, Canaan, Cyprus and Egypt toward the end of the Bronze Age.

French Egyptologist Emmanuel de Rougé first used the term peuples de la mer (literally "peoples of the sea") in 1855 in a description of reliefs on the Second Pylon at Medinet Habu documenting Year 8 of Ramesses III. Gaston Maspero, de Rougé's successor at the Collège de France, subsequently popularized the term "Sea Peoples" — and an associated migration-theory — in the late 19th century. Since the early 1990s, his migration theory has been brought into question by a number of scholars.

The Sea Peoples remain unidentified in the eyes of most modern scholars and hypotheses regarding the origin of the various groups are the source of much speculation. Existing theories variously propose equating them with several Aegean tribes, raiders from Central Europe, scattered soldiers who turned to piracy or who had become refugees, and links with natural disasters such as earthquakes or climatic shifts.

🔗 Economics 🔗 New York City

The National Debt Clock is a billboard-sized running total display which constantly updates to show the current United States gross national debt and each American family's share of the debt. It is currently installed on the western side of One Bryant Park, west of Sixth Avenue between 42nd and 43rd Streets in Manhattan, New York City. It was the first debt clock installed anywhere.

The idea for the clock came from New York real estate developer Seymour Durst, who wanted to highlight the rising national debt. In 1989, he sponsored the installation of the first clock, which was originally placed on Sixth Avenue between 42nd and 43rd Streets, one block away from Times Square. In 2004, the original clock was dismantled and replaced by a newer clock near 44th Street and Sixth Avenue. In 2008, as the U.S. national debt exceeded $10 trillion for the first time, it was reported that the value of the debt may have exceeded the number of digits in the clock. The lit dollar-sign in the clock's leftmost digit position was later changed to the "1" digit to represent the ten-trillionth place. In 2017, the clock was moved again to One Bryant Park, near its original location.

🔗 Film 🔗 Film/Japanese cinema

Ornamental Hairpin (簪, Kanzashi) is a 1941 Japanese comedy-drama film written and directed by Hiroshi Shimizu. It is based on the short story Yottsu no yubune (四つの湯槽, lit. "The four bathtubs") by Masuji Ibuse.

🔗 Internet culture

Warnock's dilemma, named for its originator Bryan Warnock, is the problem of interpreting a lack of response to a posting in a virtual community. The term originally referred to mailing list discussions, but has been applied to Usenet posts, blogs, web forums, and online content in general. The dilemma arises because a lack of response does not necessarily imply that no one is interested in the topic, but could also mean for example that readers find the content to be exceptionally good (leaving nothing for commenters to add).

On many Internet forums, only around one percent of users create new posts, while nine percent reply and 90 percent are lurkers that do not contribute to the discussion. When no users reply, the original poster has no way of knowing what lurkers think of their contribution.

Warnock's dilemma leads to online writers and publishers adopting more provocative writing strategies in order to ensure that they will get a response. However, this can also lead publishers to avoid producing the kind of content that might fail to generate comments due to its high quality. This problem arises particularly with sites that focus on viral content, such as BuzzFeed and Huffington Post.

🔗 Geology

Ruin marble is a kind of limestone or marble that contains light and dark patterns. It can give the impression of a ruined city scape.

It originates mostly from the city of Florence in the commune of Tuscany, in Central Italy. Its color pattern consists mainly of gray, brown and reddish, sometimes also blue and black, giving it the impression of a ruined landscape painting. The patterns (similar to Liesegang rings) develop during diagenesis due to periodic rhythmic precipitation of iron and manganese hydroxides from oxidizing aqueous fluids restricted laterally by calcite and clay filled joints.

🔗 Zoroastrianism

An Atash Behram (Fire of Victory) is the highest grade of fire that can be placed in a Zoroastrian fire temple as an eternal flame. The other two lower graded fires are Atash Adaran and below Adaran is the Atash Dadgah; these three grades signify the degree of reverence and dignity these are held in. The establishment and consecration of the Atash Behram fire is the most elaborate of all the grades of fire. It involves the gathering of 16 different types of fire, including fire by lightning (i.e. gathering up any branch of tree ignited by a lightning strike), fire from a cremation pyre, fire from trades where a furnace is operated, and fires from the hearths as is also the case for the Atash Adaran. Each of the 16 fires is then subject to a purification ritual before it joins the others. A large team of priests are required for the purification and consecration ceremonies, which can take up to a year to complete.

The religious significance of gathering purifying and consecrating several fires is to purify and return to Ahura Mazda His first pure creation in its pristine form, to become a focus of worship and His eternal pure symbol, never allowed to go out. The sacred fire at Udvada Atash Behram, for example, kindled in 721 CE in Sanjan, burns continually to this day, now in Udvada since 1741, and housed in a magnificent Persian style temple building since 1742.

🔗 Measurement

ISO 1 is an international standard set by the International Organization for Standardization that specifies the standard reference temperature for geometrical product specification and verification. The temperature is fixed at 20 °C, which is equal to 293.15 kelvins and 68 degrees Fahrenheit.

Due to thermal expansion, precision length measurements need to be made at (or converted to) a defined temperature. ISO 1 helps in comparing measurements by defining such a reference temperature. The reference temperature of 20 °C was adopted by the CIPM on 15 April 1931, and became ISO recommendation number 1 in 1951. It soon replaced worldwide other reference temperatures for length measurements that manufacturers of precision equipment had used before, including 0 °C, 62 °F, and 25 °C. Among the reasons for choosing 20 °C was that this was a comfortable and practical workshop temperature and that it resulted in an integer value on both the Celsius and Fahrenheit scales.