Dear Principal,↵
I am writing as the head student because many students have expressed their concerns about the recent security incidents at nearby schools. We propose a few measures to increase students' privacy and safety. First, planting trees around the school would prevent outsiders from watching students, which helps protect students' privacy and reduces their exposure to external risks. Additionally, more CCTV cameras and security guards could be added near the entrances to detect unauthorized access and respond quickly to any incidents. On behalf of the students, I hope that you will kindly consider these suggestions. Thank you.↵
Sincerely,↵
David Miller

To see how borrowing and lending changes a person's worldview, consider what the rate of interest does to people's perception of time. Imagine you are lending to somebody at an interest rate of 10 percent per year for five years. This rate tells us that the money lent has a cost that reflects the risk of you not being repaid and the opportunity cost of not spending that money yourself. The longer the term of the loan, the higher the chance you won't be paid back because it is further into the future —which by definition is unknowable — and the longer you will have to wait before spending the money yourself. In order to make this worthwhile for the lender, money has to have a price — a cost to the borrower and income to the lender. This price factors in the value of time. To put it another way, a bird in the hand is worth two in the bush.

Consistent though he may be, some of Aristotle's ideas meet us today as strange. He had no difficulty justifying slavery, for example, and in his era, philosophers enjoyed positions of high privilege and influence. Because of their practice of contemplation for the highest human good, philosophers were considered worthy to have all the best things in life. Somehow that assertion seems oddly self-serving. It serves us to remember that every great thinker is of her own time and speaks to a particular audience, and certainly Aristotle is no exception. Human flourishing as he understood it probably would not be nearly as inclusive as we would want it to be today. How he understood right and good is best taken to be an indicator of how the privileged elite of ancient Greek society tended to understand right and good. As a result, for all it does well, it is also deeply flawed.

The graph above illustrates the shares of respondents in seven countries who purchased products because celebrities or influencers advertised them in 2019 and 2025. In 2025, among the countries, Brazil recorded the highest percentage of respondents who purchased products advertised by celebrities or influencers at 47%, followed by India. China had the highest percentage of respondents who purchased those products in 2019, but among the countries, it was the only one whose percentage decreased between 2019 and 2025. During the same period, South Korea showed the largest increase in the percentage of respondents who purchased those products and its percentage in 2025 was less than double that in 2019. Both Italy and the United States had percentages below 20% in 2019, but the percentages exceeded 20% in 2025. Japan remained the lowest-ranked country among the seven countries in both years in the percentage of respondents who purchased products advertised by celebrities or influencers.

<Skydale High School's 3D Printing Workshop>↵
Discover the exciting world of 3D printing! Make your own 3D products easily with your teachers.↵
Date: November 14, 2026↵
Place: Einstein Hall↵
Participation Fee: $20 per person (Cost for materials is included.)↵
Participants: Skydale High School students of any grade↵
Schedule↵
* 9 a.m. - 10 a.m. - Learning how to use 3D printing software↵
* 10 a.m. - 11 a.m. - Designing your own 3D product↵
* 11 a.m. - 12 p.m. - Printing the 3D product you designed↵
Notes↵
* Registration is only available on our school website (www.skydalehigh.edu).↵
* Your 3D-printed products will be displayed at the lobby.↵
※ For more information, visit our school website.

A person who lives eighty years lives some twenty-nine thousand days, and the overwhelming majority of the behaviour packed into them runs on settings laid down, most of them, decades earlier and rarely inspected since. This need not be a hopeless thought. In one light it is a triumph of engineering. If you had to consciously decide every footstep and every fork-grip and every word, you would never make it out of bed; the deliberate mind is far too slow and too costly to run a whole life in real time, and any creature that tried would be outcompeted by a creature that didn't. The automation is precisely what frees the captain to come up on deck for the few problems that actually require him. The default is not a flaw in the human design. It is arguably the central feature, the thing that makes a complex life affordable at all.

Scientific developments and technologies in medical practice have brought us enormous progress in the treatment and prevention of infectious diseases. The discovery of penicillin in 1928 by Alexander Fleming, for which he later received the Nobel Prize, was one of the biggest breakthroughs in the battle against infectious diseases. Edward Jenner discovered around 1796 that humans were protected against the deadly smallpox virus after exposure to the cowpox virus, which is harmless to humans. Vaccines developed in laboratories have contributed enormously to the reduction of the burden of bacterial and viral diseases and have even led to the elimination of poxvirus. For other infectious diseases (for example cholera and malaria), control and hygiene management measures have reduced their burden, while for others treatment therapies turned viral diseases that were deadly into chronic manageable diseases.

When we say that water is "clean," we don't just mean that it looks like a glass of water. Water quality is about following a certain set of criteria, or "benchmarks." These guidelines inform us exactly how much physical, chemical, or biological stuff can be in the water. These rules ensure the water is safe for anything we want to do with it, whether that's drinking it at home, watering crops on a farm, or running it through a huge industrial boiler. We can't utilize the same "one size fits all" rule for everyone because we use water for so many diverse things. For instance, the water that cools down a huge power plant generator doesn't need to be as clean as the water you drink from the kitchen tap. This is why groups set different "safety limits" for the water dependent on how it will be utilized.