Among these questions:
What is the secret of North Korean leader's toilet?
Why was Singapore selected to host the summit?
According to a report in Time magazine, the chances were likely that the summit would be held in the demilitarized zone between the two Koreas and in a less neutral country such as Switzerland, where Kim spent years as a child.
But after the US and North Korean teams conducted a deeper study, Singapore proved to be ideal for the summit, for the following reasons:
Singapore's security, police and intelligence ranks highest in the world.
It is the safest country in Asia and sixth in the world.
Singapore regularly hosts high-level international events such as the Shangri-La Dialogue, which attracts state leaders and billionaires.
She had previously hosted a high-sensitivity summit between Chinese President Xi Jinping and former Taiwanese President Ma Ying-jeou in 2015.
The distance between Pyongyang and Singapore is seven hours by plane, which is much closer to any country than Switzerland, which was one of the proposed countries to host the summit.
The richness of the Singaporean state has contributed to its selection as a venue for the summit, and given the sanctions imposed on North Korea, it will not be able to pay for the organization of the summit.
"Yes, but it is a cost that we would like to bear to play a small role in this historic meeting," the Singaporean defense minister said when asked about his country's cost of the summit. This will be difficult in other options like Mongolia.
Singapore has had diplomatic relations with North Korea for four decades. Even before 2016, North Koreans could travel to Singapore without a visa, making it a favorite destination for recreation and treatment.
At the same time, Singapore has strong relations with the United States in both trade and security.
Not subject to Americans:
Few of those countries that refuse to bow to US pressure, even China finally agreed to return three US players at Trump's request despite being convicted of theft.
This is not happening in Singapore, which was punished and imprisoned by an American and did not pay attention to Washington's pressure.
The North Korean leader:
Kim arrived in Singapore Sunday for a summit with US President Donald Trump in Sentosa island resort.
In a Reuters video, Kim's bodyguards ran alongside his black Mercedes, making a ring around her.
This happened as the North Korean leader's motorcade left his hotel to meet Singaporean Prime Minister Lee Hsien Loong.
The scene was almost identical during a summit Kim gathered with South Korean President Mon Jie in April.
The second thing that caught the eye is that Kim brought mobile latrines to Singapore.
The Business Insider magazine said the North Korean leader always brings toilets wherever he goes.
She pointed out that latrines were not found on the leader's train but in smaller vehicles such as cars or vehicles designed for difficult terrain such as mountains.
Earlier reports said the North Korean leader wanted to prevent the intelligence services from analyzing stool and thus analyzing his health.