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There are plenty of people who will go to the same place every year, because they' re comfortable and familiar with it. People are experiencing less and less the places they are at. They might be there in body, but not necessarily in mind, because a lot of people are constantly thinking: "How am I going to present myself to my social media group back home through my posts on Facebook or Instagram?"

But this is just one side of the problem. On the other side, our travel has taken a toll on the environment. It is reported that the carbon emissions from air travel accounted for 2.5% of global emissions in 2019, and this figure may triple (增至三倍) by 2050.

I admit that there has been a considerable increase in people's awareness about the environment. And some people say that this can eventually lead to a shift in our behavior as tourists. However, I can't share their optimism. A lot of research has been done into the extent to which tourists are willing to adapt their behavior. And even those people who regularly consume or behave in an environmentally friendly fashion actually temporarily forget their environmental commitments, and behave like normal tourists. They do suffer some kind of eco-guilt, but nevertheless they continue to travel, and they continue to fly.

I'm old enough to remember when tourism was just the summer holiday, and you would look forward to those two weeks a year when you would go on holiday. It was special and meaningful, but nowadays it is so easy to travel. Travel is now seen as a right, not as a privilege. However, to some extent, I hope there will be a significant rise in the cost of travel, or at least in air travel. In my opinion, only in this way can people realize the value of travel experience and really enjoy it. Also, only in this way can many problems arising with the development of tourism be properly solved.

Wild animals are usually studied indirectly through clues that they leave behind, like fur, feathers or waste. That means certain animals - especially the small, fast and shy ones - are often missed in traditional wildlife surveys. Because all living organisms shed DNA into the air of the environment they live in, the two research groups hoped they could use those genetic traces, called eDNA, to find out what animals frequent an area.

One of the biggest challenges of working with airborne eDNA is avoiding contamination (污染) from other sources, which could muddle (弄乱) results."The zoo becomes this perfect environment where we know everything that we're detecting has only one possible source," says Clare. "My lab doesn't handle tiger DNA ever, so if we're detecting a tiger, there is no other source."

To see if eDNA could be detected in the air, both teams placed filters in different zoo enclosures, including both indoor and outdoor exhibits. Bohmann's group collected 40 air samples in three locations around the Copenhagen Zoo. They also tested three different air sampling devices. Clare's group took a similar approach but instead used just one type of air pump.

Though both groups were optimistic that their idea could work, they were still shocked at their results. In the 40 samples that Bohmann's group collected, they successfully found 49 species including mammals, birds, reptiles and fish. "We had no idea that this would actually work so well," says Bohmann. Clare's team also identified DNA from more than two dozen different species of animals from their samples, including tigers, lemurs and dingoes.

"It's really exciting looking at how both of these papers have produced the same results," says Mark Johnson, who studies eDNA at Texas Tech University. While hopeful about the future of airborne eDNA, Johnson notes huge leaps need to be made before the techniques used in the zoo can be applied in the field. Collecting eDNA in the wild adds a host of new variables. "The next step is to take it from the zoo into the natural environment and see what we find there," says Johnson.

Something about this — I can't think what — comes out sounding quite desperate and he looks at me as if I've just suggested he prove his love for me with a face tattoo (纹身). It's a look of suspicion, but also of tender concern for my mental state. This is his fifth Father's Day, so I can't help feeling slightly wounded that the concept hasn't stuck with him. I also can't help noting that he has never had any such issue with Mother's Day, which has always seemed to him like common sense.

The event's nearness to his own birthday two weeks from now — is making things more difficult for him to tolerate. It would seem he finds it impolite that the run-up to his special day should be interrupted so close to the finish line by a day that celebrates me, the lesser of his two parents. In any case, if he's planning to make or gift me something, this conversation has been a masterstroke (妙举) of expectation management.

"So, will all daddies get a Father's Day?" he asks. "Yes," I reply, "and this isn't new — it's every year!" I attempt to regulate my voice, but also make it very clear I haven't made this idea up on the spot by myself. "You've been doing it since you were born. And it's been around longer than that. I get things for Granddad every year, too."

At this he stirs himself up. He has never quite stopped being fascinated by the idea that his granddad is my dad, in the same way that I am his.

"What do you get him?" he asks. "Well," I say, "things like CDs or socks — and always a card." At this he seems inspired. "I'll do a card!" he says, brightening.

"You could buy me something, too. . ." I begin, but he is no longer listening, running to grab coloured paper and glittery pens. Not wishing to see this gift to myself a whole week early, I smile and tell him I really shouldn't be watching and get up to leave him to it.

"Yes," he says, just in time for me to see he's actually writing "Dear Granddad" on the page. "Don't tell him!"

Appliances

Approved appliances for use in students' rooms include: clocks, computers, fans, televisions, lamps and single cup coffee makers without a stay-on heating element.

Students may use the following appliances with care: hair dryers, irons and heating pads.

These appliances may not be used at all in student rooms: gas appliances, electric blankets, candle warmers, non-university-provided air conditioners and refrigerators.

Damage

Students are responsible for the condition of their room and the furniture assigned to that room, a Room Inspection Record must be completed and signed by each student. From this record, hall staff can identify problems and make needed repairs; students also avoid charges for damage done by previous occupants. Students will be charged for any damage found in the room that is not noted on the Room Inspection Record.

Cooking

Because cooking is not permitted in student rooms, each hall has a kitchen or kitchenette for the use of all students. Students must clean up after cooking. This is not the responsibility of housekeeping staff. With the exception of using a microwave oven to heat food, students are not permitted to cook in their rooms.

Pets

Pets can create safety and sanitation (卫生) problems, and therefore, are not permitted in students' rooms. Fish is the only acceptable pet permitted in a room and may not be kept in tanks no longer than 5 gallons. Students who are found with unacceptable pets, whether visiting or owned by them, are facing an initial fine of $100 and a continuing fine of 50 a day per pet. Students receive a written notice when the fine goes into effect. If one week from the date of the written notice the pet is not removed, the student is referred to the Student Court.