New York City actually is responsible for less than half of all economic activity in its own metropolitan area, the data show. According to the city comptroller’s office, its economic activity constitutes 43% of the region’s total economy.

. . .

The New York City metropolitan area, which includes parts of Connecticut up to Bridgeport, as well as Long Island and northern New Jersey, accounts for 6.6% of the country’s population while contributing 9.1%, or $1.129 trillion, of the country’s GDP.

A few hundred years of construction by humans in New York City, it turns out, have resulted in an abundance of structures that mimic the conditions bees like best — from the water towers that dot the rooftops to the cornices and overhangs that adorn the buildings.

And each year about this time, thousands of bees swarm to those sites in the city, setting up hives and causing a certain amount of apprehension among the people who spot them.

Many calls are made to the Police Department, and are directed to Officer Anthony Planakis, 46, a beekeeper in his free time and for the last 14 years the department’s in-house expert on the subject.

When Officer Planakis joined the department in 1994 he had to fill out a form listing his areas of interest and expertise, and he put beekeeping — a skill learned from his father — at the top of the list

“New York City provides endless places that make great hives,” he says.

On Tuesday, for the second time in two days, Officer Planakis was dispatched to an apartment building in the Bronx, on the corner of Crotona Avenue and 182nd Street, where a swarm of bees had congregated to build a hive.

On Monday, dressed in a protective suit and mask, he had sprayed sugar water to weigh down the bees clustered on a corner of the three-story brick building. He then brushed the queen bee and some 6,000 of her loyal protectors into a brown box and carted them off to his personal hives in Newtown, Conn.

. . .

The largest hive he was called to remove in New York was in a forested area off the Moshulu Parkway in the Bronx, where someone had been keeping bees illegally.

“There were 12 separate hives, each with at least 60,000 bees,” he said.

The keeper was never found.

Mr. Roberts said his interest was based on simple economics. Double-deckers can carry about as many people as the longer bus that the transit agency now uses, according to Joseph Smith, senior vice president for the agency’s bus operations. But they cost less to maintain because they lack the complicated connector and accordion apparatus that links the two portions of an articulated bus.

Those who rode the double-deckers in their heyday have fond memories.

“Back in the days when money was important, it was great to take a date out and you could have a nice ride up and a nice ride back on a summer evening,” said William J. Ronan, 95, who first rode the buses when he came to New York during his student days in the 1930s (three decades later, he became the first chairman of the Metropolitan Transportation Authority).

“It was sort of a genteel way to travel and perfectly respectable,” he said. “Between that and the Staten Island Ferry you could have a wonderful date.”

Mr. Ronan said the seats in front on the upper deck were considered the best ones. “You tried to get up in the front seats, which were great because you had the view up the avenue,” he said.

. . .

Mr. Ronan tried to bring the double-decker buses back in 1976, when the transportation authority bought eight of them from a British company to be used in a pilot program. [Transit spokesman Charles F.] Seaton said the buses had mechanical problems and were off the road after about two years.

But there were other problems, including on the continuation of some Fifth Avenue routes where the buses travel along Riverside Drive.

There is no view to admire. The trains are still well below street level, on tracks running within a box-shaped concrete tunnel that bisects the World Trade Center site. But instead of soil, the south half of that 975-foot stretch of subway rests on a newly built network of brawny steel beams atop a forest of minipiles reaching down to bedrock.

And in recent weeks, workers have dug out so much soil from around those minipiles that they have created an underpass beneath the subway large enough for construction machinery to pass through. In the reconstruction of the trade center, it is a significant milestone of east meeting west.

Gradually, the entire volume under the subway box will be cleared of soil, until the section from Liberty to Vesey Streets is structurally more like a viaduct than a tunnel.

That will open up nearly 40 feet of vertical space under the tracks. And given how many purposes the site must serve, every cubic inch is precious.

It took seven buses and three subway trains to trek through five boroughs along roughly the same 26.2-mile route some 40,000 runners will follow this Sunday.

My race began on the S53 bus in Staten Island, and like the start of the actual marathon, there was little space to breathe.

I had to duck errant elbows and fists, and thanks to one of my fellow riders, I was overcome by the odor of a thousand people sweating.

. . .

If I made every single connection, I could complete the marathon in three hours, 45 minutes — a respectable finish an hour quicker than my running time last year.

. . .

I crossed the finish line in Central Park in four hours, 57 minutes — two minutes slower than I ran the race in 2006.

Of that time, I spent three hours, 15 minutes riding buses and subways and another one hour, 42 minutes waiting for them.