topic 1 of 7 · Biology
Open an anther and there are four sacs inside
Structure of anther and pollen sacs
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topic 2 of 7 · Biology
Four walls around the pollen, each doing one job
Microsporangium wall layers
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topic 3 of 7 · Biology
Pollen survives fossilisation. Its outer coat is why.
Pollen grain structure (exine & intine)
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topic 4 of 7 · Biology
One cell divides and becomes four pollen grains
Microsporogenesis
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topic 5 of 7 · Biology
Seven cells, eight nuclei, and one of them matters most
Female gametophyte formation (embryo sac)
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topic 6 of 7 · Biology
A flower can pollinate itself. Most try hard not to.
Pollination types (self, cross, geitonogamy)
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topic 7 of 7 · Biology
Plants evolved tricks to avoid their own pollen
Outbreeding devices
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topic 1 of 7 · Biotechnology
Two recipes, one dish. DNA from different species, joined.
Recombinant DNA (rDNA)
stitching DNA from different sources like mixing two recipes into one dish
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topic 2 of 7 · Biotechnology
Copying one useful gene, endlessly
Gene Cloning
making endless copies of a useful gene, like photocopying notes before boards
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topic 3 of 7 · Biotechnology
The afternoon someone first remixed a living thing
Cohen–Boyer Experiment
the moment scientists first “remixed” life in a lab
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topic 4 of 7 · Biotechnology
Scissors that cut DNA at one exact sequence, every time
Restriction Enzymes
molecular scissors that cut DNA at exact spots
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topic 5 of 7 · Biotechnology
The glue that seals a cut in DNA
DNA Ligase
the glue that seals DNA fragments together
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topic 6 of 7 · Biotechnology
A circle of DNA that works as a delivery truck
Plasmids
tiny circular DNA rings acting like delivery trucks inside bacteria
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topic 7 of 7 · Biotechnology
A jagged cut joins easily. A clean cut struggles.
Sticky Ends vs Blunt Ends
jagged vs clean cuts that decide how DNA pieces join
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topic 1 of 7 · English
The day the lesson mattered was the day it ended
The Last Lesson
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topic 2 of 7 · English
He dreaded the class. Then he wanted it to go on.
Franz’s Fear to Realisation
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topic 3 of 7 · English
He could not finish the sentence, so he wrote it
M. Hamel’s Last Gesture
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topic 4 of 7 · English
Lose the language and something else goes with it
Language as Identity
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topic 5 of 7 · English
You notice what it was worth once it is gone
Role of Regret in Learning
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topic 6 of 7 · English
Children sorting rubbish at dawn, and calling it work
Lost Spring
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topic 7 of 7 · English
His name means lord of the universe. He is barefoot.
Irony of Saheb’s Name
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topic 1 of 7 · Physics
Rub a comb on your hair and it picks up paper
Properties of Electric Charge
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topic 2 of 7 · Physics
Double the distance and the force drops to a quarter
Coulomb’s Law
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topic 3 of 7 · Physics
Three charges. Add the forces one pair at a time.
Superposition Principle
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topic 4 of 7 · Physics
The charge is not touching anything. It still pushes.
Electric Field Concept
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topic 5 of 7 · Physics
Lines nobody can see, drawn to make a force visible
Electric Field Lines
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topic 6 of 7 · Physics
Two equal charges, opposite signs, a small gap
Electric Dipole
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topic 7 of 7 · Physics
It does not move. It turns.
Dipole in Uniform Field
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topic 1 of 7 · Chemistry
Salt vanishes into water and changes everything about it
What Makes a Solution “Disappear”
how salt vanishes into water yet changes everything about it
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topic 2 of 7 · Chemistry
Oil refuses water, then mixes happily with grease
Like Dissolves Like
why oil refuses water but mixes easily with grease
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topic 3 of 7 · Chemistry
How much is actually dissolved in there?
Ways to Measure Concentration
how chemists keep track of “how much is dissolved”
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topic 4 of 7 · Chemistry
One changes with temperature. One does not.
Molarity vs Molality
why temperature secretly matters in one but not the other
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topic 5 of 7 · Chemistry
Add salt and the liquid becomes less eager to leave
Vapour Pressure Lowering
why adding solute makes liquids less eager to escape
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topic 6 of 7 · Chemistry
Each part contributes, in proportion. Mostly.
Raoult’s Law
how each component quietly contributes to total vapour pressure
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topic 7 of 7 · Chemistry
Some mixtures behave. Some do not. There is a reason.
Ideal vs Non-Ideal Solutions
when mixtures behave politely… and when they don’t
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topic 1 of 7 · Psychology
Same room, same lesson, two completely different students
Individual Differences
why two classmates in the same room still think, feel, and react so differently
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topic 2 of 7 · Psychology
You behave differently at home. The room is doing it.
Situationism
when the situation quietly controls behavior more than personality does
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topic 3 of 7 · Psychology
Invisible traits deciding how you study and decide
Psychological Attributes
the invisible traits shaping how you study, react, and decide
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topic 4 of 7 · Psychology
A test treats every answer the same way. Is that fair?
Formal Assessment
that structured test setting where every answer counts the same way
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topic 5 of 7 · Psychology
The teacher who knows your strengths without testing
Informal Assessment
the teacher who “just knows” your strengths without a test
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topic 6 of 7 · Psychology
One hidden ability behind everything you think?
Spearman’s g-Factor
the idea that one hidden ability powers all your thinking
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topic 7 of 7 · Psychology
Good at maths, lost in poetry. The same brain.
Specific Abilities (s-factors)
why you might ace math but struggle with poetry
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topic 3 · 78 secondsPollen grain structure (exine & intine)
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topic 3 · 84 secondsCohen–Boyer Experiment
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topic 3 · 73 secondsM. Hamel’s Last Gesture
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topic 3 · 75 secondsSuperposition Principle
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Biology
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Biotechnology
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English
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Physics
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Chemistry
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Psychology
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