Question: What type of popcorns have long kernal points at both ends?
About the article "Popcorn", section "Expansion and yield".

Candidate passages:
Popping results are sensitive to the rate at which the kernels are heated.
If heated too quickly, the steam in the outer layers of the kernel can reach high pressures and rupture the hull before the starch in the center of the kernel can fully gelatinize, leading to partially popped kernels with hard centers.
Heating too slowly leads to entirely unpopped kernels: the tip of the kernel, where it attached to the cob, is not entirely moisture-proof, and when heated slowly, the steam can leak out of the tip fast enough to keep the pressure from rising sufficiently to break the hull and cause the pop.
Producers and sellers of popcorn consider two major factors in evaluating the quality of popcorn: what percentage of the kernels will pop, and how much each popped kernel expands.
Expansion is an important factor to both the consumer and vendor.
For the consumer, larger pieces of popcorn tend to be more tender and are associated with higher quality.
For the grower, distributor, and vendor, expansion is closely correlated with profit: vendors such as theaters buy popcorn by weight and sell it by volume.
For both these reasons, higher-expansion popcorn fetches a higher profit per unit weight.
Popcorn will pop when freshly harvested, but not well: its high moisture content leads to poor expansion and chewy pieces of popcorn.
Kernels with a high moisture content are also susceptible to mold when stored.
For these reasons, popcorn growers and distributors dry the kernels until they reach the moisture level at which they expand the most.
This differs by variety and conditions, but is generally in the range of 14–15% moisture by weight.
If the kernels are over-dried, the expansion rate will suffer and the percentage of kernels that pop at all will decline.
When the popcorn has finished popping, sometimes unpopped kernels remain.
Known in the popcorn industry as "old maids", the kernels don't pop because they do not have enough moisture to create enough steam for an explosion.
Rehydrating prior to popping usually results in eliminating the unpopped kernels.
Popcorn varieties are broadly categorized by the shape of the kernels, the color of the kernels, or the shape of the popped corn.
While the kernels may come in a variety of colors, the popped corn is always off-yellow or white as it is only the hull (or pericarp) that is colored.
"Rice" type popcorns have a long kernel pointed at both ends; "pearl" type kernels are rounded at the top.
Commercial popcorn production has moved mostly to pearl types.
Historically, pearl popcorns were usually yellow and rice popcorns usually white.
Today both shapes are available in both colors, as well as others including black, red, and variegated.
Commercial production is dominated by white and yellow.
A simple, yet characteristic, example of applying the KERNAL is given by the following 6502 assembly language subroutine (written in ca65 assembler format/syntax):This code stub employs the codice_1 routine, whose address is found at address codice_2 (65490), to send a text string to the default output device (e.g., the display screen). 
Lt. Kernal was the name given to a SCSI hard drive subsystem developed for the Commodore 64 and Commodore 128 home computers.
The original design of both the technically complicated hardware interface and equally complex disk operating system came from Lloyd Sponenburgh and Roy Southwick of Fiscal Information, Inc., a now-defunct Florida-based turnkey vendor of minicomputer-based medical information systems.
Fiscal demonstrated a working prototype in 1984 and starting advertising the system for sale early in 1985.
It immediately found a niche with some Commodore software developers and bulletin board SysOps of the day, due to its excellent performance and capacious storage (originally 10 megabytes and later extended to as much as 330 megabytes).
The subsequent development of a multiplexing accessory allowed one Lt. Kernal to be shared by as many as 16 computers, using a round robin scheduling algorithm.
This made the use of the Lt. Kernal with multiple line BBSs practical.
Later, streaming tape support, using QIC-02 tape cartridges, was added to provide a practical (though costly) backup strategy.
A key feature of the Lt. Kernal was its sophisticated disk operating system, which behaved much like that of the Point 4 minicomputers that Fiscal was reselling in the 1980s.
A high degree of control over the Lt. Kernal was possible with simple typed commands, many of which had never been seen before in the eight bit Commodore environment.
This, along with a powerful keyed random access filing system, made the Lt. Kernal perform at a level that was generally unmatched by any other hard drive system available for eight bit Commodore computers.
Fiscal built the units to order until late 1986, at which time the decision was made to turn over the production, marketing and customer support to Xetec Inc. Fiscal continued to provide secondary technical support, as well as free DOS upgrades, until December 1991, at which time production of new Lt. Kernal systems ceased.
Following the shutdown of Xetec in 1995, private support of the Lt. Kernal was carried on for several years by Ron Fick until his untimely death in 1999. 
The C64 KERNAL uses a vector table at page 3 to allow redirection of common kernal file handling and basic functions.
This feature is used by IDEDOS to hook into the C64 kernal.
The operating system itself is divided into four pages of 16 KiB which are mapped in when required.
The mapping is temporarily switched off while interrupts are running for increased compatibility, however this causes a ≈40 μs latency.
Additional RAM for buffers and internal data are also mapped in from either the IDE64 cartridge (28 KiB) or the additional RAM of the SuperCPU is used.
The standard kernal memory locations at page zero and page two are handled in a kernal-compatible way; temporarily used memory is restored after the routines are finished.
Beyond the kernal table IDEDOS has two new calls for bulk data handling (read/write) which allows much faster data transfer rates than the character-based I/O.
The native file system is non-CBM style at the low level to allow partitions greater than 16 MiB.
High-level features like the 16-character filenames or filetypes are retained.
Due to complexity and memory requirements, the filesystem creation and consistency check is not part of the operating system, unlike CBM DOS or CMD DOS.
Additional filesystems like ISO 9660 or FAT are abstracted internally and mostly use the same routines for handling, thereby little difference is noticeable to user programs, except if some features are not fully implemented.
The device handling is done by additional device numbers assigned to the new devices.
The device numbers for IDEDOS devices are configurable and is normally in the range of 10–14.
Over the years many programs assumed that there is only device 8 and do not allow selecting anything else; this can be worked around by temporary changing the used IDEDOS device number to 8.
For standard devices, the original kernal routines are used, while IDEDOS devices use custom routines which closely imitate the results and behavior of kernal calls for floppy devices.
Kernal calls not going through the vector table (most notably IEC bus-specific calls) present an incompatibility with those programs using them.
Special features (like CD-ROM audio handling) are implemented by new channel 15 commands, while features not found on floppy drives follow the CMD style commands to allow programs to easily support a wider range of devices.
Unlike intelligent external devices which have a separate processor (like 1541 with CBMDOS), IDEDOS runs on the host computer, thereby all disk routines block until finished.
This rules out the use of "IRQ loaders" which are commonly used to speed up operation of serial bus peripherals.
Interrupts are generally allowed while IDEDOS is running (they are disabled on rare time-critical operations), however the system was written to be non-reentrant, just like the original kernal. 
Kernal "Kitch" Roberts (born Kernal Lincoln Roberts, 20 September 1980) is a soca producer, singer and songwriter from Trinidad and Tobago.
He is best known for producing Trinidad and Tobago Carnival Road March winners in 2006, 2007, 2010 and 2011.
He is currently the Creative Director at Rama Studios which operates out of "Rainorama", the home of calypsonian Lord Kitchener, who was Roberts' father.
He is the cousin of soca artist Patrice Roberts.