Speech
Topics

Ethics and philosophy3–5 minA rule can tell you what must follow if its premises are true. A pattern in observations can suggest what you may find next. Deduction and induction make these different kinds of move: a valid deduction still needs true premises, while further observations can overturn an inductive generalization.

Ethics and philosophy3–5 minCereal sits in liquid and is eaten with a spoon. Is that enough to make it soup? A definition can admit surprising cases or exclude foods people ordinarily call soup. The disagreement becomes useful when it exposes what categories are for: a kitchen label need not behave like a mathematical rule with a perfectly sharp boundary.

Ethics and philosophy3–7 minTwo imagined choices can save the same number of people yet feel morally different. Redirecting a runaway trolley and using a person to stop it raise questions about intentions, duties, and whether a good result can justify the means.

Ethics and philosophy3–7 minA chair and a pile of chair parts may contain exactly the same wood. Something changes when the pieces are assembled, but is it the material, the arrangement, or our willingness to sit on it? Philosophers disagree about whether an object is identical to its material and what happens when that material changes.

Ethics and philosophy3–7 minA booking deadline can communicate a real constraint, while a countdown that resets can manufacture urgency. Both may make a choice feel immediate, but they give the buyer very different information.

Ethics and philosophy3–7 minA warning can start to feel routine when earlier incidents did not end in disaster. A NASA engineer’s retrospective on Columbia describes how previous foam strikes became a reason to discount concern, even though a safe landing had not demonstrated that the underlying problem was harmless.

Ethics and philosophy3–5 minA diary and a memory both exist in the present, even when they refer to yesterday. Bertrand Russell’s five-minute-world thought experiment asks what would happen if a fictional alternative reproduced all that present evidence, without treating that alternative as a serious history of the world.

Ethics and philosophy4–6 minWe can agree that a tomato is red and choose the same matching paint. Does that agreement show that red feels the same to each of us? The puzzle separates what we can compare publicly from what another person’s experience is like.

Ethics and philosophy3–7 minA colleague may honestly recommend a supplier while having a personal connection that affects the decision. A conflict of interest concerns competing obligations or interests; identifying one is different from proving that someone has acted dishonestly.

Ethics and philosophy3–5 minSuppose a computer could reproduce your memories and personality perfectly. If the original you remained alive, would the copy be another version of you or a new person who remembers your life? Making two copies sharpens the puzzle: psychological continuity and continued physical existence do not automatically give the same answer.

Ethics and philosophy3–5 minIn a fictional universe, making contact need not feel like an invitation to friendship. Liu Cixin’s The Dark Forest offers a starting point for thinking about uncertainty, secrecy, and other civilizations. The interesting boundary is between the assumptions of a story and evidence about the real universe.

Ethics and philosophy5–7 minA brain signal that appears before a movement sounds like evidence that the decision was already made. But what exactly does that signal measure? Research on simple self-timed actions shows why averaging, task instructions, and the meaning of “decision” matter. A result about when to move a finger cannot by itself settle every question about human choice.