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Photographs
- The cartographer’s error
Antique engraved map by Willem Blaeu / Public domain / source on Wikimedia Commons - Why soap works, and why water alone does not
Bar of soap by No machine-readable author provided. Lacrimosus assumed (based on copyright claims). / Public domain / source on Wikimedia Commons - Why the sky is blue, and why it is not violet
Blue sky and clouds by ElooKoN / CC BY-SA 4.0 / source on Wikimedia Commons - Overnight oats: the ratio matters more than the recipe
Bowl of oats by Bodhi Peace / CC BY-SA 4.0 / source on Wikimedia Commons - The long way round
Canal towpath by Steve Daniels / CC BY-SA 2.0 / source on Wikimedia Commons - Why onions make you cry
Chopped onions by HungryHuy / CC BY 2.0 / source on Wikimedia Commons - How to plan a weekend away that actually rests you
Coastal bay by Terry Kearney from liverpool, merseyside / CC0 / source on Wikimedia Commons - An octopus has three hearts, and that is why it would rather walk than swim
Common octopus by Diego Delso / CC BY-SA 4.0 / source on Wikimedia Commons - Use by, best before, and the difference that matters
Date label on packaging by Chenspec / CC BY-SA 4.0 / source on Wikimedia Commons - Two days in Jaipur, and what actually needs the time
Hawa Mahal, Jaipur by Marcin Białek / CC BY-SA 4.0 / source on Wikimedia Commons - Why bread goes stale faster in the fridge
Homemade loaf of bread by Horacio Cambeiro / CC BY-SA 3.0 / source on Wikimedia Commons - The second key
House keys at a door lock by Shixart1985 / CC BY 2.0 / source on Wikimedia Commons - The lamp room
Lighthouse lantern room by Bellbird190 / CC BY-SA 4.0 / source on Wikimedia Commons - The masala omelette, and why you should salt the eggs last
Masala omelette by SwingingUvula / CC BY-SA 4.0 / source on Wikimedia Commons - A mint and lemon cooler that does not go bitter
Mint lemonade by Twilightin / CC BY-SA 4.0 / source on Wikimedia Commons - How a refrigerator actually works
Open refrigerator by USDAgov / Public domain / source on Wikimedia Commons - How to pack a carry-on for a week without thinking about it again
Packing a carry-on suitcase by Familydestinationsguide.com Images / CC BY 2.0 / source on Wikimedia Commons - The case for the overnight train
Sleeper train compartment by Maksym Kozlenko / CC BY-SA 4.0 / source on Wikimedia Commons - Why the Moon always shows us the same face
The Moon's near side by NASA/GSFC/Arizona State University / Public domain / source on Wikimedia Commons - Why a cake sinks in the middle
Victoria sponge cake by Victoria Spongebob / CC BY-SA 4.0 / source on Wikimedia Commons
Licence summaries
CC0 places the work in the public domain. Public domain means copyright has expired or the work was produced by a body that releases it freely, such as NASA or the USDA. CC BY requires credit to the author. CC BY-SA requires credit and that derivative works carry the same licence. Full licence texts are available at creativecommons.org.
Photographs added August 2026
- Aloo paratha: why the filling breaks out, and how to stop it
Aloo paratha by Gannu03 / CC BY-SA 4.0 / source on Wikimedia Commons - Besan chilla: the batter is the whole recipe
Besan chilla by Patelaahil / CC BY-SA 4.0 / source on Wikimedia Commons - Caramelised onions take forty minutes, and no recipe changes that
Caramelising onions by ccbarr / CC BY-SA 2.0 / source on Wikimedia Commons - Dal tadka, and why the tempering goes on at the end
Dal tadka by AugustineKajur / CC BY-SA 4.0 / source on Wikimedia Commons - Delhi to Jaipur: four ways, and which one suits which trip
New Delhi railway station by Ravi Dwivedi / CC BY-SA 4.0 / source on Wikimedia Commons - First trip to India: the things that actually catch people out
An Indian market by Schüler1000 / CC BY-SA 4.0 / source on Wikimedia Commons - Getting around Jaipur without losing half the day to it
Jaipur street traffic by Wolfgang Sauber / CC BY-SA 4.0 / source on Wikimedia Commons - Indian train classes, and which one you actually want
Indian Railways sleeper coach by Vikramaditya V. V. / CC BY-SA 4.0 / source on Wikimedia Commons - Jaipur has three hill forts. Only one of them needs a morning.
Amber Fort, Jaipur by Jakub Hałun / CC BY-SA 4.0 / source on Wikimedia Commons - Jantar Mantar: what the instruments actually measure
Vrihat Samrat Yantra, Jantar Mantar by Jakub Hałun / CC BY-SA 4.0 / source on Wikimedia Commons - Lot 41: contents of a piano stool
Piano rolls in their boxes by Wilfredor / CC0 / source on Wikimedia Commons - The 19:40 to Carlisle
A platform clock by michael ely / CC BY-SA 2.0 / source on Wikimedia Commons - The best time to visit Jaipur, and what each season actually costs you
Jaipur City Palace by Miniondo / CC BY-SA 4.0 / source on Wikimedia Commons - The complaint
A service counter by Creator:Petri Lagus / CC BY 2.0 / source on Wikimedia Commons - The last wash
Rain on glass by Juairiaa / CC BY 4.0 / source on Wikimedia Commons - The Taj Mahal: getting the timing right matters more than anything else
The Taj Mahal, Agra by Yann; edited by King of Hearts / CC BY-SA 4.0 / source on Wikimedia Commons - Three letters to the occupant
A handwritten letter by an unnamed contributor / Public domain / source on Wikimedia Commons - Two days in Udaipur, and why it asks for a slower trip than Jaipur
Udaipur and Lake Pichola by Jakub Hałun / CC BY-SA 4.0 / source on Wikimedia Commons - Vegetable poha, and why yours turns to mush
Vegetable poha by Advaitj11 / CC BY-SA 4.0 / source on Wikimedia Commons - What seasoning a cast iron pan actually is, and why yours keeps rusting
A cast iron pan by Evan-Amos / Public domain / source on Wikimedia Commons - What to eat in Jaipur, and what each dish actually is
Rajasthani thali by Kaapeine / CC BY-SA 4.0 / source on Wikimedia Commons - Why a chapati puffs, and why yours does not
Chapati by safaritravelplus / CC0 / source on Wikimedia Commons - Why a room feels colder than the thermostat says
A domestic radiator by Donald Trung Quoc Don (Chữ Hán: 徵國單) – Wikimedia Commons – © CC BY-SA 4.0 International.(Want to use this image?)Original publication 📤: –Donald Trung 『徵國單』 (No Fake News 💬) (WikiProject Numismatics 💴) (Articles 📚) 20:14, 15 January 2022 (UTC) / CC BY-SA 4.0 / source on Wikimedia Commons - Why clean clothes still smell, and what is actually living in your machine
Washing machine drum by Petar Milošević / CC BY-SA 4.0 / source on Wikimedia Commons - Why homemade curd does not set, and the temperature that decides it
Homemade curd by Goumisao / CC BY-SA 4.0 / source on Wikimedia Commons - Why ice floats, and why almost nothing else does
An iceberg by AWeith / CC BY-SA 4.0 / source on Wikimedia Commons - Why knives go blunt, and what sharpening actually removes
Sharpening a knife on a whetstone by Didriks / CC BY 2.0 / source on Wikimedia Commons - Why paneer goes rubbery, and when to put it in
Fresh paneer by Ian Brown / CC BY 2.0 / source on Wikimedia Commons - Why phone batteries get worse, and the habits that slow it down
A lithium-ion phone battery by Raimond Spekking / CC BY-SA 4.0 / source on Wikimedia Commons - Why rice goes sticky, and the two habits that fix it
Cooked rice by Sureshkhole / CC BY-SA 4.0 / source on Wikimedia Commons - Why the sea is salty, and why rivers are not
Sea salt pans by Dey.sandip / CC BY 3.0 / source on Wikimedia Commons - Why the tide comes in twice a day
Tidal flats at low tide by John Samuel / CC BY-SA 4.0 / source on Wikimedia Commons - Why the wind blows, and why it does not blow straight
Approaching cloud ahead of a front by Famartin / CC BY-SA 4.0 / source on Wikimedia Commons - Why we have leap years, and why some are skipped
A February calendar page by Theo van Hoytema / Public domain / source on Wikimedia Commons - Why your chai turns bitter, and the boil that causes it
Masala chai by Dadhichbittu007 / CC BY-SA 4.0 / source on Wikimedia Commons
Diagrams and illustrations
The explanatory diagrams that appear inside articles are original work produced for HRITU and are not sourced from third parties. Where a diagram plots a relationship schematically rather than from measured data, its caption says so.