Wacky Facts: Surprising, True & Sourced

Leap years skip three times every 400 years.

Years divisible by 100 are not leap years unless divisible by 400 — so 2000 was, 1900 was not.

The cornea has no blood vessels.

It gets oxygen directly from the air and nutrients from tears and the fluid behind it.

Excel thinks 29 February 1900 existed — it didn’t.

1900 was not a leap year, but Excel treats it as one. The bug was copied on purpose from Lotus 1-2-3 so that spreadsheets moved between the two programs would keep the same date serial numbers. It is still there today for compatibility.

An adult human has roughly 60,000 miles of blood vessels.

Laid end to end, all the arteries, veins and capillaries would stretch an estimated tens of thousands of miles — often quoted as enough to circle the Earth more than twice. Most of that length is tiny capillaries.

The @ in email addresses was chosen in 1971.

Ray Tomlinson sent the first networked email and needed a symbol that would never appear in a person’s name. He picked @ because it read naturally as “user at host”.

UPI processes billions of payments every month.

Launched in 2016, UPI became India’s most popular digital payment system, handling well over ten billion transactions a month by 2024.

A blue whale’s heart can weigh about as much as a small car’s engine.

Measurements of a blue whale heart preserved in Canada put it at around 180 kg. Blue whales are the largest animals known to have ever lived, up to about 30 m long.

The Beatles never learned to read music.

None of the four could read standard musical notation; they composed by ear.

1907Plastic was invented in 1907.

Short answer: In 1907, chemist Leo Baekeland produced Bakelite, recognized as the world’s first fully synthetic plastic. Earlier mouldable materials existed, but many depended on chemically modified natural polymers.

What did Baekeland invent?

Baekeland reacted phenol with formaldehyde under controlled heat and pressure. The resulting resin could be moulded and then hardened permanently. Unlike a thermoplastic that softens again when heated, Bakelite is thermosetting: once its molecular network has cured, it remains rigid until extreme heat causes it to degrade.

Why was Bakelite different?

Nineteenth-century materials such as celluloid used cellulose, a natural polymer, as their starting framework. They were important plastics, but they were not made entirely from small synthetic chemical building blocks. Bakelite did not rely on a naturally occurring polymer structure, which is why the American Chemical Society describes it as the first synthetic plastic.

What made it useful?

The material resisted heat, moisture and many solvents, held its shape and worked as an electrical insulator. Manufacturers used phenolic resins for electrical fittings, telephone and radio housings, appliance handles, jewellery and industrial components. Dark colours were common because fillers and the resin’s natural colour limited the bright transparency possible with some later plastics.

From experiment to industry

Baekeland’s successful material dates to 1907, but commercial development took time. He announced the work publicly in 1909 and formed the General Bakelite Company in 1910. Those dates explain why histories may cite 1907, 1909 or 1910: they refer respectively to the invention, public technical announcement and industrial organization.

A quick materials timeline

1860s–1870s: modified-natural-polymer plastics such as celluloid develop.
1907: Baekeland creates the fully synthetic phenol-formaldehyde resin.
1909: he presents detailed technical work on Bakelite.
1910: commercial production expands through the General Bakelite Company.

Evidence and limits

It is misleading to say simply that “plastic did not exist before 1907.” People used natural polymers and semi-synthetic plastics earlier. The precise historical claim is that Bakelite was the first fully synthetic plastic, a distinction recognized by the American Chemical Society’s National Historic Chemical Landmarks programme.

Why the distinction still matters

“Plastic” describes a large family, not a single substance. Modern packaging may use polyethylene or PET; plumbing may use PVC; electronics may use engineering polymers and thermoset resins. Bakelite did not become every later plastic, but it demonstrated that chemists could design a durable material from synthetic molecular ingredients. That conceptual leap is why 1907 is treated as the beginning of the modern polymer age.

Sources

A cricket pitch is exactly 22 yards long.

That is about 20.12 m, a length that has not changed since the 18th century.

Thiruvalluvar’s Thirukkural has 1,330 couplets.

The Tamil classic on ethics, wealth and love is one of the most translated works from India.

Humans are the only animals known to blush.

Charles Darwin called blushing “the most peculiar and the most human of all expressions”.

Butterflies taste with their feet.

Taste receptors on their feet let female butterflies check whether a leaf is the right plant to lay eggs on.

People remember unfinished tasks better.

The Zeigarnik effect suggests interrupted tasks stay on our minds, which is why cliffhangers work.

Light from the Sun takes about 8 minutes to reach Earth.

The Sun is about 150 million km away and light travels at about 300,000 km per second, so we always see the Sun as it was roughly eight minutes and twenty seconds ago.

Sharks existed before trees.

The earliest sharks appear in the fossil record around 450 million years ago; the first true trees appeared roughly 385 million years ago.

The Qutub Minar is the tallest brick minaret.

Built from 1199, the 72.5 m tower in Delhi is a UNESCO World Heritage Site.

The Dead Sea is so salty you float effortlessly.

Its water is about ten times saltier than the ocean, and its shore is one of the lowest points on land, over 400 m below sea level.

Parle-G’s G stood for Glucose

Parle Gluco biscuits launched in 1939; the name became Parle-G in the 1980s. The company later said G also means Genius.

Brahmagupta gave rules for negative numbers.

In 628 CE he described arithmetic with zero and negative numbers, calling them fortunes and debts.

111,111,111 × 111,111,111 = 12,345,678,987,654,321.

Squaring repunits (numbers made of 1s) produces palindromes up to nine digits.

Zero is an even number.

Zero divided by 2 is 0, a whole number, so it meets the definition of even.

India has the world’s largest postal network.

Short answer: India Post operates the world’s largest postal network. Its official network page listed 164,999 post offices as of 31 March 2025, with more than nine out of ten located in rural areas.

What makes the network unusually large?

India combines a population of more than a billion people with enormous geographic variety. Postal workers serve dense cities, Himalayan settlements, islands, deserts and remote villages. India Post reports 15,614 urban offices and 149,385 rural offices, including a very large number of branch post offices designed for last-mile service.

Is India Post only about letters?

No. The Department of Posts delivers mail and parcels, but its offices also provide savings accounts, money transfers, Postal Life Insurance, Rural Postal Life Insurance and retail services. Many locations help distribute pensions and government payments, collect bills and support services such as Aadhaar and passport applications.

Why do rural post offices matter?

Commercial banks and specialist government offices are not equally accessible everywhere. A local branch post office can give a village a familiar point for communication, savings and public services. India Post says more than 5,700 offices were opened in unbanked villages during the 2023–24 financial year to bring banking access within five kilometres.

Who runs the last mile?

The network includes departmental employees and Gramin Dak Sevaks, or GDS workers. Branch postmasters and other GDS staff provide postal and financial services in rural communities, often with handheld digital devices. The organisation divides the country into postal circles and uses sorting hubs, railway mail facilities, road transport and air links to move items between local offices.

How did the modern system develop?

Organised postal systems existed in India long before independence. The modern all-India department grew under the Post Office Act of 1854, which helped standardise rates and administration. After 1947 the network expanded deeply into rural areas and later added banking, insurance, electronic payments and digital tracking.

Network snapshot

Total offices: 164,999 as reported for March 2025.
Rural offices: 149,385.
Urban offices: 15,614.
Average area served: about 19.92 square kilometres per office.
Average population served: about 7,339 people per office.

Evidence and limits

“Largest postal network” refers to the number and distribution of post offices, not necessarily annual parcel volume, revenue or delivery speed. Counts also change as branches open, merge or are reclassified, so a dated official figure is better than an undated “more than 150,000” claim. Private couriers operate alongside India Post but are not part of this government network count.

Sources

2001English Wikipedia now has more than 7 million articles.

Short answer: English Wikipedia passed seven million articles in May 2025. Its live statistics now show well over seven million, so the older “more than six million” claim remains technically true but no longer describes the current milestone clearly.

What counts as an article?

Wikipedia’s article counter does not include every page on the website. Talk pages, user profiles, help pages, category pages, redirects and internal administration pages belong to other namespaces. The article total mainly counts content pages that contain an internal link and are not redirects.

How is the number updated?

MediaWiki, the software behind Wikipedia, calculates site statistics continuously from the database. The Special:Statistics page provides a live count, while the main page displays a rounded or automatically updated figure. This is more reliable for a current number than a screenshot or an old news article.

Why does the count keep growing?

Volunteer editors create articles about people, places, species, events, works and technical subjects. Existing lists can be split into fuller standalone articles when reliable sources support them. New discoveries and current events also generate pages, although Wikipedia’s notability and sourcing rules are intended to prevent the encyclopedia from becoming an unrestricted directory.

Does seven million mean seven million polished articles?

No. Articles vary greatly in length and quality. Some are carefully developed featured articles with extensive references; others are short “stubs” awaiting expansion. Pages may contain warnings about missing sources, disputed statements or cleanup needs. The count measures quantity, not accuracy or completeness.

Can anyone edit everything?

Most pages can be edited by the public, but some are protected because of vandalism, disputes or high visibility. Changes are recorded in a public history, and editors can revert problems. Volunteers, automated filters and software tools monitor activity, but errors can still remain.

Milestones at a glance

January 2001: English Wikipedia begins.
March 2006: it reaches one million articles.
January 2020: it reaches six million.
May 2025: it passes seven million.
Current figure: changes continuously on Special:Statistics.

Evidence and limits

Because pages are created, merged and deleted, any exact number becomes outdated quickly. A durable article should state the milestone and link to live statistics rather than freezing a rapidly changing count. Article totals also cannot be compared perfectly across language editions if their editorial practices and automated creation methods differ.

The practical lesson is simple: use Wikipedia as a starting map, follow its citations to stronger sources, and check revision history when accuracy or recent change matters.